Root/src/FastDelegate.h

1// FastDelegate.h
2// Efficient delegates in C++ that generate only two lines of asm code!
3// Documentation is found at http://www.codeproject.com/cpp/FastDelegate.asp
4//
5// - Don Clugston, Mar 2004.
6// Major contributions were made by Jody Hagins.
7// History:
8// 24-Apr-04 1.0 * Submitted to CodeProject.
9// 28-Apr-04 1.1 * Prevent most unsafe uses of evil static function hack.
10// * Improved syntax for horrible_cast (thanks Paul Bludov).
11// * Tested on Metrowerks MWCC and Intel ICL (IA32)
12// * Compiled, but not run, on Comeau C++ and Intel Itanium ICL.
13// 27-Jun-04 1.2 * Now works on Borland C++ Builder 5.5
14// * Now works on /clr "managed C++" code on VC7, VC7.1
15// * Comeau C++ now compiles without warnings.
16// * Prevent the virtual inheritance case from being used on
17// VC6 and earlier, which generate incorrect code.
18// * Improved warning and error messages. Non-standard hacks
19// now have compile-time checks to make them safer.
20// * implicit_cast used instead of static_cast in many cases.
21// * If calling a const member function, a const class pointer can be used.
22// * MakeDelegate() global helper function added to simplify pass-by-value.
23// * Added fastdelegate.clear()
24// 16-Jul-04 1.2.1* Workaround for gcc bug (const member function pointers in templates)
25// 30-Oct-04 1.3 * Support for (non-void) return values.
26// * No more workarounds in client code!
27// MSVC and Intel now use a clever hack invented by John Dlugosz:
28// - The FASTDELEGATEDECLARE workaround is no longer necessary.
29// - No more warning messages for VC6
30// * Less use of macros. Error messages should be more comprehensible.
31// * Added include guards
32// * Added FastDelegate::empty() to test if invocation is safe (Thanks Neville Franks).
33// * Now tested on VS 2005 Express Beta, PGI C++
34// 24-Dec-04 1.4 * Added DelegateMemento, to allow collections of disparate delegates.
35// * <,>,<=,>= comparison operators to allow storage in ordered containers.
36// * Substantial reduction of code size, especially the 'Closure' class.
37// * Standardised all the compiler-specific workarounds.
38// * MFP conversion now works for CodePlay (but not yet supported in the full code).
39// * Now compiles without warnings on _any_ supported compiler, including BCC 5.5.1
40// * New syntax: FastDelegate< int (char *, double) >.
41// 14-Feb-05 1.4.1* Now treats =0 as equivalent to .clear(), ==0 as equivalent to .empty(). (Thanks elfric).
42// * Now tested on Intel ICL for AMD64, VS2005 Beta for AMD64 and Itanium.
43// 30-Mar-05 1.5 * Safebool idiom: "if (dg)" is now equivalent to "if (!dg.empty())"
44// * Fully supported by CodePlay VectorC
45// * Bugfix for Metrowerks: empty() was buggy because a valid MFP can be 0 on MWCC!
46// * More optimal assignment,== and != operators for static function pointers.
47
48#ifndef FASTDELEGATE_H
49#define FASTDELEGATE_H
50#if defined(_MSC_VER) && _MSC_VER > 1000
51#pragma once
52#endif // _MSC_VER > 1000
53
54#include <memory.h> // to allow <,> comparisons
55
56////////////////////////////////////////////////////////////////////////////////
57// Configuration options
58//
59////////////////////////////////////////////////////////////////////////////////
60
61// Uncomment the following #define for optimally-sized delegates.
62// In this case, the generated asm code is almost identical to the code you'd get
63// if the compiler had native support for delegates.
64// It will not work on systems where sizeof(dataptr) < sizeof(codeptr).
65// Thus, it will not work for DOS compilers using the medium model.
66// It will also probably fail on some DSP systems.
67#define FASTDELEGATE_USESTATICFUNCTIONHACK
68
69// Uncomment the next line to allow function declarator syntax.
70// It is automatically enabled for those compilers where it is known to work.
71//#define FASTDELEGATE_ALLOW_FUNCTION_TYPE_SYNTAX
72
73////////////////////////////////////////////////////////////////////////////////
74// Compiler identification for workarounds
75//
76////////////////////////////////////////////////////////////////////////////////
77
78// Compiler identification. It's not easy to identify Visual C++ because
79// many vendors fraudulently define Microsoft's identifiers.
80#if defined(_MSC_VER) && !defined(__MWERKS__) && !defined(__VECTOR_C) && !defined(__ICL) && !defined(__BORLANDC__)
81#define FASTDLGT_ISMSVC
82
83#if defined(_MSC_VER) && _MSC_VER < 1300 // Many workarounds are required for VC6.
84#define FASTDLGT_VC6
85#pragma warning(disable:4786) // disable this ridiculous warning
86#endif
87
88#endif
89
90// Does the compiler uses Microsoft's member function pointer structure?
91// If so, it needs special treatment.
92// Metrowerks CodeWarrior, Intel, and CodePlay fraudulently define Microsoft's
93// identifier, _MSC_VER. We need to filter Metrowerks out.
94#if defined(_MSC_VER) && !defined(__MWERKS__)
95#define FASTDLGT_MICROSOFT_MFP
96
97#if !defined(__VECTOR_C)
98// CodePlay doesn't have the __single/multi/virtual_inheritance keywords
99#define FASTDLGT_HASINHERITANCE_KEYWORDS
100#endif
101#endif
102
103// Does it allow function declarator syntax? The following compilers are known to work:
104#if defined(FASTDLGT_ISMSVC) && (_MSC_VER >=1310) // VC 7.1
105#define FASTDELEGATE_ALLOW_FUNCTION_TYPE_SYNTAX
106#endif
107
108// Gcc(2.95+), and versions of Digital Mars, Intel and Comeau in common use.
109#if defined (__DMC__) || defined(__GNUC__) || defined(__ICL) || defined(__COMO__)
110#define FASTDELEGATE_ALLOW_FUNCTION_TYPE_SYNTAX
111#endif
112
113// It works on Metrowerks MWCC 3.2.2. From boost.Config it should work on earlier ones too.
114#if defined (__MWERKS__)
115#define FASTDELEGATE_ALLOW_FUNCTION_TYPE_SYNTAX
116#endif
117
118#ifdef __GNUC__ // Workaround GCC bug #8271
119    // At present, GCC doesn't recognize constness of MFPs in templates
120#define FASTDELEGATE_GCC_BUG_8271
121#endif
122
123
124
125////////////////////////////////////////////////////////////////////////////////
126// General tricks used in this code
127//
128// (a) Error messages are generated by typdefing an array of negative size to
129// generate compile-time errors.
130// (b) Warning messages on MSVC are generated by declaring unused variables, and
131// enabling the "variable XXX is never used" warning.
132// (c) Unions are used in a few compiler-specific cases to perform illegal casts.
133// (d) For Microsoft and Intel, when adjusting the 'this' pointer, it's cast to
134// (char *) first to ensure that the correct number of *bytes* are added.
135//
136////////////////////////////////////////////////////////////////////////////////
137// Helper templates
138//
139////////////////////////////////////////////////////////////////////////////////
140
141
142namespace fastdelegate {
143namespace detail { // we'll hide the implementation details in a nested namespace.
144
145// implicit_cast< >
146// I believe this was originally going to be in the C++ standard but
147// was left out by accident. It's even milder than static_cast.
148// I use it instead of static_cast<> to emphasize that I'm not doing
149// anything nasty.
150// Usage is identical to static_cast<>
151template <class OutputClass, class InputClass>
152inline OutputClass implicit_cast(InputClass input){
153    return input;
154}
155
156// horrible_cast< >
157// This is truly evil. It completely subverts C++'s type system, allowing you
158// to cast from any class to any other class. Technically, using a union
159// to perform the cast is undefined behaviour (even in C). But we can see if
160// it is OK by checking that the union is the same size as each of its members.
161// horrible_cast<> should only be used for compiler-specific workarounds.
162// Usage is identical to reinterpret_cast<>.
163
164// This union is declared outside the horrible_cast because BCC 5.5.1
165// can't inline a function with a nested class, and gives a warning.
166template <class OutputClass, class InputClass>
167union horrible_union{
168    OutputClass out;
169    InputClass in;
170};
171
172template <class OutputClass, class InputClass>
173inline OutputClass horrible_cast(const InputClass input){
174    horrible_union<OutputClass, InputClass> u;
175    // Cause a compile-time error if in, out and u are not the same size.
176    // If the compile fails here, it means the compiler has peculiar
177    // unions which would prevent the cast from working.
178    typedef int ERROR_CantUseHorrible_cast[sizeof(InputClass)==sizeof(u)
179        && sizeof(InputClass)==sizeof(OutputClass) ? 1 : -1];
180    u.in = input;
181    return u.out;
182}
183
184////////////////////////////////////////////////////////////////////////////////
185// Workarounds
186//
187////////////////////////////////////////////////////////////////////////////////
188
189// Backwards compatibility: This macro used to be necessary in the virtual inheritance
190// case for Intel and Microsoft. Now it just forward-declares the class.
191#define FASTDELEGATEDECLARE(CLASSNAME) class CLASSNAME;
192
193// Prevent use of the static function hack with the DOS medium model.
194#ifdef __MEDIUM__
195#undef FASTDELEGATE_USESTATICFUNCTIONHACK
196#endif
197
198// DefaultVoid - a workaround for 'void' templates in VC6.
199//
200// (1) VC6 and earlier do not allow 'void' as a default template argument.
201// (2) They also doesn't allow you to return 'void' from a function.
202//
203// Workaround for (1): Declare a dummy type 'DefaultVoid' which we use
204// when we'd like to use 'void'. We convert it into 'void' and back
205// using the templates DefaultVoidToVoid<> and VoidToDefaultVoid<>.
206// Workaround for (2): On VC6, the code for calling a void function is
207// identical to the code for calling a non-void function in which the
208// return value is never used, provided the return value is returned
209// in the EAX register, rather than on the stack.
210// This is true for most fundamental types such as int, enum, void *.
211// Const void * is the safest option since it doesn't participate
212// in any automatic conversions. But on a 16-bit compiler it might
213// cause extra code to be generated, so we disable it for all compilers
214// except for VC6 (and VC5).
215#ifdef FASTDLGT_VC6
216// VC6 workaround
217typedef const void * DefaultVoid;
218#else
219// On any other compiler, just use a normal void.
220typedef void DefaultVoid;
221#endif
222
223// Translate from 'DefaultVoid' to 'void'.
224// Everything else is unchanged
225template <class T>
226struct DefaultVoidToVoid { typedef T type; };
227
228template <>
229struct DefaultVoidToVoid<DefaultVoid> { typedef void type; };
230
231// Translate from 'void' into 'DefaultVoid'
232// Everything else is unchanged
233template <class T>
234struct VoidToDefaultVoid { typedef T type; };
235
236template <>
237struct VoidToDefaultVoid<void> { typedef DefaultVoid type; };
238
239
240
241////////////////////////////////////////////////////////////////////////////////
242// Fast Delegates, part 1:
243//
244// Conversion of member function pointer to a standard form
245//
246////////////////////////////////////////////////////////////////////////////////
247
248// GenericClass is a fake class, ONLY used to provide a type.
249// It is vitally important that it is never defined, so that the compiler doesn't
250// think it can optimize the invocation. For example, Borland generates simpler
251// code if it knows the class only uses single inheritance.
252
253// Compilers using Microsoft's structure need to be treated as a special case.
254#ifdef FASTDLGT_MICROSOFT_MFP
255
256#ifdef FASTDLGT_HASINHERITANCE_KEYWORDS
257    // For Microsoft and Intel, we want to ensure that it's the most efficient type of MFP
258    // (4 bytes), even when the /vmg option is used. Declaring an empty class
259    // would give 16 byte pointers in this case....
260    class __single_inheritance GenericClass;
261#endif
262    // ...but for Codeplay, an empty class *always* gives 4 byte pointers.
263    // If compiled with the /clr option ("managed C++"), the JIT compiler thinks
264    // it needs to load GenericClass before it can call any of its functions,
265    // (compiles OK but crashes at runtime!), so we need to declare an
266    // empty class to make it happy.
267    // Codeplay and VC4 can't cope with the unknown_inheritance case either.
268    class GenericClass {};
269#else
270    class GenericClass;
271#endif
272
273// The size of a single inheritance member function pointer.
274const int SINGLE_MEMFUNCPTR_SIZE = sizeof(void (GenericClass::*)());
275
276// SimplifyMemFunc< >::Convert()
277//
278// A template function that converts an arbitrary member function pointer into the
279// simplest possible form of member function pointer, using a supplied 'this' pointer.
280// According to the standard, this can be done legally with reinterpret_cast<>.
281// For (non-standard) compilers which use member function pointers which vary in size
282// depending on the class, we need to use knowledge of the internal structure of a
283// member function pointer, as used by the compiler. Template specialization is used
284// to distinguish between the sizes. Because some compilers don't support partial
285// template specialisation, I use full specialisation of a wrapper struct.
286
287// general case -- don't know how to convert it. Force a compile failure
288template <int N>
289struct SimplifyMemFunc {
290    template <class X, class XFuncType, class GenericMemFuncType>
291    inline static GenericClass *Convert(X *pthis, XFuncType function_to_bind,
292        GenericMemFuncType &bound_func) {
293        // Unsupported member function type -- force a compile failure.
294        // (it's illegal to have a array with negative size).
295        typedef char ERROR_Unsupported_member_function_pointer_on_this_compiler[N-100];
296        return 0;
297    }
298};
299
300// For compilers where all member func ptrs are the same size, everything goes here.
301// For non-standard compilers, only single_inheritance classes go here.
302template <>
303struct SimplifyMemFunc<SINGLE_MEMFUNCPTR_SIZE> {
304    template <class X, class XFuncType, class GenericMemFuncType>
305    inline static GenericClass *Convert(X *pthis, XFuncType function_to_bind,
306            GenericMemFuncType &bound_func) {
307#if defined __DMC__
308        // Digital Mars doesn't allow you to cast between abitrary PMF's,
309        // even though the standard says you can. The 32-bit compiler lets you
310        // static_cast through an int, but the DOS compiler doesn't.
311        bound_func = horrible_cast<GenericMemFuncType>(function_to_bind);
312#else
313        bound_func = reinterpret_cast<GenericMemFuncType>(function_to_bind);
314#endif
315        return reinterpret_cast<GenericClass *>(pthis);
316    }
317};
318
319////////////////////////////////////////////////////////////////////////////////
320// Fast Delegates, part 1b:
321//
322// Workarounds for Microsoft and Intel
323//
324////////////////////////////////////////////////////////////////////////////////
325
326
327// Compilers with member function pointers which violate the standard (MSVC, Intel, Codeplay),
328// need to be treated as a special case.
329#ifdef FASTDLGT_MICROSOFT_MFP
330
331// We use unions to perform horrible_casts. I would like to use #pragma pack(push, 1)
332// at the start of each function for extra safety, but VC6 seems to ICE
333// intermittently if you do this inside a template.
334
335// __multiple_inheritance classes go here
336// Nasty hack for Microsoft and Intel (IA32 and Itanium)
337template<>
338struct SimplifyMemFunc< SINGLE_MEMFUNCPTR_SIZE + sizeof(int) > {
339    template <class X, class XFuncType, class GenericMemFuncType>
340    inline static GenericClass *Convert(X *pthis, XFuncType function_to_bind,
341        GenericMemFuncType &bound_func) {
342        // We need to use a horrible_cast to do this conversion.
343        // In MSVC, a multiple inheritance member pointer is internally defined as:
344        union {
345            XFuncType func;
346            struct {
347                GenericMemFuncType funcaddress; // points to the actual member function
348                int delta; // #BYTES to be added to the 'this' pointer
349            }s;
350        } u;
351        // Check that the horrible_cast will work
352        typedef int ERROR_CantUsehorrible_cast[sizeof(function_to_bind)==sizeof(u.s)? 1 : -1];
353        u.func = function_to_bind;
354        bound_func = u.s.funcaddress;
355        return reinterpret_cast<GenericClass *>(reinterpret_cast<char *>(pthis) + u.s.delta);
356    }
357};
358
359// virtual inheritance is a real nuisance. It's inefficient and complicated.
360// On MSVC and Intel, there isn't enough information in the pointer itself to
361// enable conversion to a closure pointer. Earlier versions of this code didn't
362// work for all cases, and generated a compile-time error instead.
363// But a very clever hack invented by John M. Dlugosz solves this problem.
364// My code is somewhat different to his: I have no asm code, and I make no
365// assumptions about the calling convention that is used.
366
367// In VC++ and ICL, a virtual_inheritance member pointer
368// is internally defined as:
369struct MicrosoftVirtualMFP {
370    void (GenericClass::*codeptr)(); // points to the actual member function
371    int delta; // #bytes to be added to the 'this' pointer
372    int vtable_index; // or 0 if no virtual inheritance
373};
374// The CRUCIAL feature of Microsoft/Intel MFPs which we exploit is that the
375// m_codeptr member is *always* called, regardless of the values of the other
376// members. (This is *not* true for other compilers, eg GCC, which obtain the
377// function address from the vtable if a virtual function is being called).
378// Dlugosz's trick is to make the codeptr point to a probe function which
379// returns the 'this' pointer that was used.
380
381// Define a generic class that uses virtual inheritance.
382// It has a trival member function that returns the value of the 'this' pointer.
383struct GenericVirtualClass : virtual public GenericClass
384{
385    typedef GenericVirtualClass * (GenericVirtualClass::*ProbePtrType)();
386    GenericVirtualClass * GetThis() { return this; }
387};
388
389// __virtual_inheritance classes go here
390template <>
391struct SimplifyMemFunc<SINGLE_MEMFUNCPTR_SIZE + 2*sizeof(int) >
392{
393
394    template <class X, class XFuncType, class GenericMemFuncType>
395    inline static GenericClass *Convert(X *pthis, XFuncType function_to_bind,
396        GenericMemFuncType &bound_func) {
397        union {
398            XFuncType func;
399            GenericClass* (X::*ProbeFunc)();
400            MicrosoftVirtualMFP s;
401        } u;
402        u.func = function_to_bind;
403        bound_func = reinterpret_cast<GenericMemFuncType>(u.s.codeptr);
404        union {
405            GenericVirtualClass::ProbePtrType virtfunc;
406            MicrosoftVirtualMFP s;
407        } u2;
408        // Check that the horrible_cast<>s will work
409        typedef int ERROR_CantUsehorrible_cast[sizeof(function_to_bind)==sizeof(u.s)
410            && sizeof(function_to_bind)==sizeof(u.ProbeFunc)
411            && sizeof(u2.virtfunc)==sizeof(u2.s) ? 1 : -1];
412   // Unfortunately, taking the address of a MF prevents it from being inlined, so
413   // this next line can't be completely optimised away by the compiler.
414        u2.virtfunc = &GenericVirtualClass::GetThis;
415        u.s.codeptr = u2.s.codeptr;
416        return (pthis->*u.ProbeFunc)();
417    }
418};
419
420#if (_MSC_VER <1300)
421
422// Nasty hack for Microsoft Visual C++ 6.0
423// unknown_inheritance classes go here
424// There is a compiler bug in MSVC6 which generates incorrect code in this case!!
425template <>
426struct SimplifyMemFunc<SINGLE_MEMFUNCPTR_SIZE + 3*sizeof(int) >
427{
428    template <class X, class XFuncType, class GenericMemFuncType>
429    inline static GenericClass *Convert(X *pthis, XFuncType function_to_bind,
430        GenericMemFuncType &bound_func) {
431        // There is an apalling but obscure compiler bug in MSVC6 and earlier:
432        // vtable_index and 'vtordisp' are always set to 0 in the
433        // unknown_inheritance case!
434        // This means that an incorrect function could be called!!!
435        // Compiling with the /vmg option leads to potentially incorrect code.
436        // This is probably the reason that the IDE has a user interface for specifying
437        // the /vmg option, but it is disabled - you can only specify /vmg on
438        // the command line. In VC1.5 and earlier, the compiler would ICE if it ever
439        // encountered this situation.
440        // It is OK to use the /vmg option if /vmm or /vms is specified.
441
442        // Fortunately, the wrong function is only called in very obscure cases.
443        // It only occurs when a derived class overrides a virtual function declared
444        // in a virtual base class, and the member function
445        // points to the *Derived* version of that function. The problem can be
446        // completely averted in 100% of cases by using the *Base class* for the
447        // member fpointer. Ie, if you use the base class as an interface, you'll
448        // stay out of trouble.
449        // Occasionally, you might want to point directly to a derived class function
450        // that isn't an override of a base class. In this case, both vtable_index
451        // and 'vtordisp' are zero, but a virtual_inheritance pointer will be generated.
452        // We can generate correct code in this case. To prevent an incorrect call from
453        // ever being made, on MSVC6 we generate a warning, and call a function to
454        // make the program crash instantly.
455        typedef char ERROR_VC6CompilerBug[-100];
456        return 0;
457    }
458};
459
460
461#else
462
463// Nasty hack for Microsoft and Intel (IA32 and Itanium)
464// unknown_inheritance classes go here
465// This is probably the ugliest bit of code I've ever written. Look at the casts!
466// There is a compiler bug in MSVC6 which prevents it from using this code.
467template <>
468struct SimplifyMemFunc<SINGLE_MEMFUNCPTR_SIZE + 3*sizeof(int) >
469{
470    template <class X, class XFuncType, class GenericMemFuncType>
471    inline static GenericClass *Convert(X *pthis, XFuncType function_to_bind,
472            GenericMemFuncType &bound_func) {
473        // The member function pointer is 16 bytes long. We can't use a normal cast, but
474        // we can use a union to do the conversion.
475        union {
476            XFuncType func;
477            // In VC++ and ICL, an unknown_inheritance member pointer
478            // is internally defined as:
479            struct {
480                GenericMemFuncType m_funcaddress; // points to the actual member function
481                int delta; // #bytes to be added to the 'this' pointer
482                int vtordisp; // #bytes to add to 'this' to find the vtable
483                int vtable_index; // or 0 if no virtual inheritance
484            } s;
485        } u;
486        // Check that the horrible_cast will work
487        typedef int ERROR_CantUsehorrible_cast[sizeof(XFuncType)==sizeof(u.s)? 1 : -1];
488        u.func = function_to_bind;
489        bound_func = u.s.funcaddress;
490        int virtual_delta = 0;
491        if (u.s.vtable_index) { // Virtual inheritance is used
492            // First, get to the vtable.
493            // It is 'vtordisp' bytes from the start of the class.
494            const int * vtable = *reinterpret_cast<const int *const*>(
495                reinterpret_cast<const char *>(pthis) + u.s.vtordisp );
496
497            // 'vtable_index' tells us where in the table we should be looking.
498            virtual_delta = u.s.vtordisp + *reinterpret_cast<const int *>(
499                reinterpret_cast<const char *>(vtable) + u.s.vtable_index);
500        }
501        // The int at 'virtual_delta' gives us the amount to add to 'this'.
502        // Finally we can add the three components together. Phew!
503        return reinterpret_cast<GenericClass *>(
504            reinterpret_cast<char *>(pthis) + u.s.delta + virtual_delta);
505    };
506};
507#endif // MSVC 7 and greater
508
509#endif // MS/Intel hacks
510
511} // namespace detail
512
513////////////////////////////////////////////////////////////////////////////////
514// Fast Delegates, part 2:
515//
516// Define the delegate storage, and cope with static functions
517//
518////////////////////////////////////////////////////////////////////////////////
519
520// DelegateMemento -- an opaque structure which can hold an arbitary delegate.
521// It knows nothing about the calling convention or number of arguments used by
522// the function pointed to.
523// It supplies comparison operators so that it can be stored in STL collections.
524// It cannot be set to anything other than null, nor invoked directly:
525// it must be converted to a specific delegate.
526
527// Implementation:
528// There are two possible implementations: the Safe method and the Evil method.
529// DelegateMemento - Safe version
530//
531// This implementation is standard-compliant, but a bit tricky.
532// A static function pointer is stored inside the class.
533// Here are the valid values:
534// +-- Static pointer --+--pThis --+-- pMemFunc-+-- Meaning------+
535// | 0 | 0 | 0 | Empty |
536// | !=0 |(dontcare)| Invoker | Static function|
537// | 0 | !=0 | !=0* | Method call |
538// +--------------------+----------+------------+----------------+
539// * For Metrowerks, this can be 0. (first virtual function in a
540// single_inheritance class).
541// When stored stored inside a specific delegate, the 'dontcare' entries are replaced
542// with a reference to the delegate itself. This complicates the = and == operators
543// for the delegate class.
544
545// DelegateMemento - Evil version
546//
547// For compilers where data pointers are at least as big as code pointers, it is
548// possible to store the function pointer in the this pointer, using another
549// horrible_cast. In this case the DelegateMemento implementation is simple:
550// +--pThis --+-- pMemFunc-+-- Meaning---------------------+
551// | 0 | 0 | Empty |
552// | !=0 | !=0* | Static function or method call|
553// +----------+------------+-------------------------------+
554// * For Metrowerks, this can be 0. (first virtual function in a
555// single_inheritance class).
556// Note that the Sun C++ and MSVC documentation explicitly state that they
557// support static_cast between void * and function pointers.
558
559class DelegateMemento {
560protected:
561    // the data is protected, not private, because many
562    // compilers have problems with template friends.
563    typedef void (detail::GenericClass::*GenericMemFuncType)(); // arbitrary MFP.
564    GenericMemFuncType m_pFunction;
565    detail::GenericClass *m_pthis;
566
567#if !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
568    typedef void (*GenericFuncPtr)(); // arbitrary code pointer
569    GenericFuncPtr m_pStaticFunction;
570#endif
571
572public:
573#if !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
574    DelegateMemento() : m_pthis(0), m_pFunction(0), m_pStaticFunction(0) {};
575    void clear() {
576        m_pthis=0; m_pFunction=0; m_pStaticFunction=0;
577    }
578#else
579    DelegateMemento() : m_pFunction(0), m_pthis(0) {};
580    void clear() { m_pthis=0; m_pFunction=0; }
581#endif
582public:
583#if !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
584    inline bool IsEqual (const DelegateMemento &x) const{
585        // We have to cope with the static function pointers as a special case
586        if (m_pFunction!=x.m_pFunction) return false;
587        // the static function ptrs must either both be equal, or both be 0.
588        if (m_pStaticFunction!=x.m_pStaticFunction) return false;
589        if (m_pStaticFunction!=0) return m_pthis==x.m_pthis;
590        else return true;
591    }
592#else // Evil Method
593    inline bool IsEqual (const DelegateMemento &x) const{
594        return m_pthis==x.m_pthis && m_pFunction==x.m_pFunction;
595    }
596#endif
597    // Provide a strict weak ordering for DelegateMementos.
598    inline bool IsLess(const DelegateMemento &right) const {
599        // deal with static function pointers first
600#if !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
601        if (m_pStaticFunction !=0 || right.m_pStaticFunction!=0)
602                return m_pStaticFunction < right.m_pStaticFunction;
603#endif
604        if (m_pthis !=right.m_pthis) return m_pthis < right.m_pthis;
605    // There are no ordering operators for member function pointers,
606    // but we can fake one by comparing each byte. The resulting ordering is
607    // arbitrary (and compiler-dependent), but it permits storage in ordered STL containers.
608        return memcmp(&m_pFunction, &right.m_pFunction, sizeof(m_pFunction)) < 0;
609
610    }
611    // BUGFIX (Mar 2005):
612    // We can't just compare m_pFunction because on Metrowerks,
613    // m_pFunction can be zero even if the delegate is not empty!
614    inline bool operator ! () const // Is it bound to anything?
615    { return m_pthis==0 && m_pFunction==0; }
616    inline bool empty() const // Is it bound to anything?
617    { return m_pthis==0 && m_pFunction==0; }
618public:
619    DelegateMemento & operator = (const DelegateMemento &right) {
620        SetMementoFrom(right);
621        return *this;
622    }
623    inline bool operator <(const DelegateMemento &right) {
624        return IsLess(right);
625    }
626    inline bool operator >(const DelegateMemento &right) {
627        return right.IsLess(*this);
628    }
629    DelegateMemento (const DelegateMemento &right) :
630        m_pFunction(right.m_pFunction), m_pthis(right.m_pthis)
631#if !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
632        , m_pStaticFunction (right.m_pStaticFunction)
633#endif
634        {}
635protected:
636    void SetMementoFrom(const DelegateMemento &right) {
637        m_pFunction = right.m_pFunction;
638        m_pthis = right.m_pthis;
639#if !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
640        m_pStaticFunction = right.m_pStaticFunction;
641#endif
642    }
643};
644
645
646// ClosurePtr<>
647//
648// A private wrapper class that adds function signatures to DelegateMemento.
649// It's the class that does most of the actual work.
650// The signatures are specified by:
651// GenericMemFunc: must be a type of GenericClass member function pointer.
652// StaticFuncPtr: must be a type of function pointer with the same signature
653// as GenericMemFunc.
654// UnvoidStaticFuncPtr: is the same as StaticFuncPtr, except on VC6
655// where it never returns void (returns DefaultVoid instead).
656
657// An outer class, FastDelegateN<>, handles the invoking and creates the
658// necessary typedefs.
659// This class does everything else.
660
661namespace detail {
662
663template < class GenericMemFunc, class StaticFuncPtr, class UnvoidStaticFuncPtr>
664class ClosurePtr : public DelegateMemento {
665public:
666    // These functions are for setting the delegate to a member function.
667
668    // Here's the clever bit: we convert an arbitrary member function into a
669    // standard form. XMemFunc should be a member function of class X, but I can't
670    // enforce that here. It needs to be enforced by the wrapper class.
671    template < class X, class XMemFunc >
672    inline void bindmemfunc(X *pthis, XMemFunc function_to_bind ) {
673        m_pthis = SimplifyMemFunc< sizeof(function_to_bind) >
674            ::Convert(pthis, function_to_bind, m_pFunction);
675#if !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
676        m_pStaticFunction = 0;
677#endif
678    }
679    // For const member functions, we only need a const class pointer.
680    // Since we know that the member function is const, it's safe to
681    // remove the const qualifier from the 'this' pointer with a const_cast.
682    // VC6 has problems if we just overload 'bindmemfunc', so we give it a different name.
683    template < class X, class XMemFunc>
684    inline void bindconstmemfunc(const X *pthis, XMemFunc function_to_bind) {
685        m_pthis= SimplifyMemFunc< sizeof(function_to_bind) >
686            ::Convert(const_cast<X*>(pthis), function_to_bind, m_pFunction);
687#if !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
688        m_pStaticFunction = 0;
689#endif
690    }
691#ifdef FASTDELEGATE_GCC_BUG_8271 // At present, GCC doesn't recognize constness of MFPs in templates
692    template < class X, class XMemFunc>
693    inline void bindmemfunc(const X *pthis, XMemFunc function_to_bind) {
694        bindconstmemfunc(pthis, function_to_bind);
695#if !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
696        m_pStaticFunction = 0;
697#endif
698    }
699#endif
700    // These functions are required for invoking the stored function
701    inline GenericClass *GetClosureThis() const { return m_pthis; }
702    inline GenericMemFunc GetClosureMemPtr() const { return reinterpret_cast<GenericMemFunc>(m_pFunction); }
703
704// There are a few ways of dealing with static function pointers.
705// There's a standard-compliant, but tricky method.
706// There's also a straightforward hack, that won't work on DOS compilers using the
707// medium memory model. It's so evil that I can't recommend it, but I've
708// implemented it anyway because it produces very nice asm code.
709
710#if !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
711
712// ClosurePtr<> - Safe version
713//
714// This implementation is standard-compliant, but a bit tricky.
715// I store the function pointer inside the class, and the delegate then
716// points to itself. Whenever the delegate is copied, these self-references
717// must be transformed, and this complicates the = and == operators.
718public:
719    // The next two functions are for operator ==, =, and the copy constructor.
720    // We may need to convert the m_pthis pointers, so that
721    // they remain as self-references.
722    template< class DerivedClass >
723    inline void CopyFrom (DerivedClass *pParent, const DelegateMemento &x) {
724        SetMementoFrom(x);
725        if (m_pStaticFunction!=0) {
726            // transform self references...
727            m_pthis=reinterpret_cast<GenericClass *>(pParent);
728        }
729    }
730    // For static functions, the 'static_function_invoker' class in the parent
731    // will be called. The parent then needs to call GetStaticFunction() to find out
732    // the actual function to invoke.
733    template < class DerivedClass, class ParentInvokerSig >
734    inline void bindstaticfunc(DerivedClass *pParent, ParentInvokerSig static_function_invoker,
735                StaticFuncPtr function_to_bind ) {
736        if (function_to_bind==0) { // cope with assignment to 0
737            m_pFunction=0;
738        } else {
739            bindmemfunc(pParent, static_function_invoker);
740        }
741        m_pStaticFunction=reinterpret_cast<GenericFuncPtr>(function_to_bind);
742    }
743    inline UnvoidStaticFuncPtr GetStaticFunction() const {
744        return reinterpret_cast<UnvoidStaticFuncPtr>(m_pStaticFunction);
745    }
746#else
747
748// ClosurePtr<> - Evil version
749//
750// For compilers where data pointers are at least as big as code pointers, it is
751// possible to store the function pointer in the this pointer, using another
752// horrible_cast. Invocation isn't any faster, but it saves 4 bytes, and
753// speeds up comparison and assignment. If C++ provided direct language support
754// for delegates, they would produce asm code that was almost identical to this.
755// Note that the Sun C++ and MSVC documentation explicitly state that they
756// support static_cast between void * and function pointers.
757
758    template< class DerivedClass >
759    inline void CopyFrom (DerivedClass */*pParent*/, const DelegateMemento &right) {
760        SetMementoFrom(right);
761    }
762    // For static functions, the 'static_function_invoker' class in the parent
763    // will be called. The parent then needs to call GetStaticFunction() to find out
764    // the actual function to invoke.
765    // ******** EVIL, EVIL CODE! *******
766    template < class DerivedClass, class ParentInvokerSig>
767    inline void bindstaticfunc(DerivedClass *pParent, ParentInvokerSig static_function_invoker,
768                StaticFuncPtr function_to_bind) {
769        if (function_to_bind==0) { // cope with assignment to 0
770            m_pFunction=0;
771        } else {
772           // We'll be ignoring the 'this' pointer, but we need to make sure we pass
773           // a valid value to bindmemfunc().
774            bindmemfunc(pParent, static_function_invoker);
775        }
776
777        // WARNING! Evil hack. We store the function in the 'this' pointer!
778        // Ensure that there's a compilation failure if function pointers
779        // and data pointers have different sizes.
780        // If you get this error, you need to #undef FASTDELEGATE_USESTATICFUNCTIONHACK.
781        typedef int ERROR_CantUseEvilMethod[sizeof(GenericClass *)==sizeof(function_to_bind) ? 1 : -1];
782        m_pthis = horrible_cast<GenericClass *>(function_to_bind);
783        // MSVC, SunC++ and DMC accept the following (non-standard) code:
784// m_pthis = static_cast<GenericClass *>(static_cast<void *>(function_to_bind));
785        // BCC32, Comeau and DMC accept this method. MSVC7.1 needs __int64 instead of long
786// m_pthis = reinterpret_cast<GenericClass *>(reinterpret_cast<long>(function_to_bind));
787    }
788    // ******** EVIL, EVIL CODE! *******
789    // This function will be called with an invalid 'this' pointer!!
790    // We're just returning the 'this' pointer, converted into
791    // a function pointer!
792    inline UnvoidStaticFuncPtr GetStaticFunction() const {
793        // Ensure that there's a compilation failure if function pointers
794        // and data pointers have different sizes.
795        // If you get this error, you need to #undef FASTDELEGATE_USESTATICFUNCTIONHACK.
796        typedef int ERROR_CantUseEvilMethod[sizeof(UnvoidStaticFuncPtr)==sizeof(this) ? 1 : -1];
797        return horrible_cast<UnvoidStaticFuncPtr>(this);
798    }
799#endif // !defined(FASTDELEGATE_USESTATICFUNCTIONHACK)
800
801    // Does the closure contain this static function?
802    inline bool IsEqualToStaticFuncPtr(StaticFuncPtr funcptr){
803        if (funcptr==0) return empty();
804    // For the Evil method, if it doesn't actually contain a static function, this will return an arbitrary
805    // value that is not equal to any valid function pointer.
806        else return funcptr==reinterpret_cast<StaticFuncPtr>(GetStaticFunction());
807    }
808};
809
810
811} // namespace detail
812
813////////////////////////////////////////////////////////////////////////////////
814// Fast Delegates, part 3:
815//
816// Wrapper classes to ensure type safety
817//
818////////////////////////////////////////////////////////////////////////////////
819
820
821// Once we have the member function conversion templates, it's easy to make the
822// wrapper classes. So that they will work with as many compilers as possible,
823// the classes are of the form
824// FastDelegate3<int, char *, double>
825// They can cope with any combination of parameters. The max number of parameters
826// allowed is 8, but it is trivial to increase this limit.
827// Note that we need to treat const member functions seperately.
828// All this class does is to enforce type safety, and invoke the delegate with
829// the correct list of parameters.
830
831// Because of the weird rule about the class of derived member function pointers,
832// you sometimes need to apply a downcast to the 'this' pointer.
833// This is the reason for the use of "implicit_cast<X*>(pthis)" in the code below.
834// If CDerivedClass is derived from CBaseClass, but doesn't override SimpleVirtualFunction,
835// without this trick you'd need to write:
836// MyDelegate(static_cast<CBaseClass *>(&d), &CDerivedClass::SimpleVirtualFunction);
837// but with the trick you can write
838// MyDelegate(&d, &CDerivedClass::SimpleVirtualFunction);
839
840// RetType is the type the compiler uses in compiling the template. For VC6,
841// it cannot be void. DesiredRetType is the real type which is returned from
842// all of the functions. It can be void.
843
844// Implicit conversion to "bool" is achieved using the safe_bool idiom,
845// using member data pointers (MDP). This allows "if (dg)..." syntax
846// Because some compilers (eg codeplay) don't have a unique value for a zero
847// MDP, an extra padding member is added to the SafeBool struct.
848// Some compilers (eg VC6) won't implicitly convert from 0 to an MDP, so
849// in that case the static function constructor is not made explicit; this
850// allows "if (dg==0) ..." to compile.
851
852//N=0
853template<class RetType=detail::DefaultVoid>
854class FastDelegate0 {
855private:
856    typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
857    typedef DesiredRetType (*StaticFunctionPtr)();
858    typedef RetType (*UnvoidStaticFunctionPtr)();
859    typedef RetType (detail::GenericClass::*GenericMemFn)();
860    typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
861    ClosureType m_Closure;
862public:
863    // Typedefs to aid generic programming
864    typedef FastDelegate0 type;
865
866    // Construction and comparison functions
867    FastDelegate0() { clear(); }
868    FastDelegate0(const FastDelegate0 &x) {
869        m_Closure.CopyFrom(this, x.m_Closure); }
870    void operator = (const FastDelegate0 &x) {
871        m_Closure.CopyFrom(this, x.m_Closure); }
872    bool operator ==(const FastDelegate0 &x) const {
873        return m_Closure.IsEqual(x.m_Closure); }
874    bool operator !=(const FastDelegate0 &x) const {
875        return !m_Closure.IsEqual(x.m_Closure); }
876    bool operator <(const FastDelegate0 &x) const {
877        return m_Closure.IsLess(x.m_Closure); }
878    bool operator >(const FastDelegate0 &x) const {
879        return x.m_Closure.IsLess(m_Closure); }
880    // Binding to non-const member functions
881    template < class X, class Y >
882    FastDelegate0(Y *pthis, DesiredRetType (X::* function_to_bind)() ) {
883        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
884    template < class X, class Y >
885    inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)()) {
886        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
887    // Binding to const member functions.
888    template < class X, class Y >
889    FastDelegate0(const Y *pthis, DesiredRetType (X::* function_to_bind)() const) {
890        m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind); }
891    template < class X, class Y >
892    inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)() const) {
893        m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind); }
894    // Static functions. We convert them into a member function call.
895    // This constructor also provides implicit conversion
896    FastDelegate0(DesiredRetType (*function_to_bind)() ) {
897        bind(function_to_bind); }
898    // for efficiency, prevent creation of a temporary
899    void operator = (DesiredRetType (*function_to_bind)() ) {
900        bind(function_to_bind); }
901    inline void bind(DesiredRetType (*function_to_bind)()) {
902        m_Closure.bindstaticfunc(this, &FastDelegate0::InvokeStaticFunction,
903            function_to_bind); }
904    // Invoke the delegate
905    RetType operator() () const {
906    return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(); }
907    // Implicit conversion to "bool" using the safe_bool idiom
908private:
909    typedef struct SafeBoolStruct {
910        int a_data_pointer_to_this_is_0_on_buggy_compilers;
911        StaticFunctionPtr m_nonzero;
912    } UselessTypedef;
913    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
914public:
915    operator unspecified_bool_type() const {
916        return empty()? 0: &SafeBoolStruct::m_nonzero;
917    }
918    // necessary to allow ==0 to work despite the safe_bool idiom
919    inline bool operator==(StaticFunctionPtr funcptr) {
920        return m_Closure.IsEqualToStaticFuncPtr(funcptr); }
921    inline bool operator!=(StaticFunctionPtr funcptr) {
922        return !m_Closure.IsEqualToStaticFuncPtr(funcptr); }
923    inline bool operator ! () const { // Is it bound to anything?
924            return !m_Closure; }
925    inline bool empty() const {
926            return !m_Closure; }
927    void clear() { m_Closure.clear();}
928    // Conversion to and from the DelegateMemento storage class
929    const DelegateMemento & GetMemento() { return m_Closure; }
930    void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }
931
932private: // Invoker for static functions
933    RetType InvokeStaticFunction() const {
934    return (*(m_Closure.GetStaticFunction()))(); }
935};
936
937//N=1
938template<class Param1, class RetType=detail::DefaultVoid>
939class FastDelegate1 {
940private:
941    typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
942    typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1);
943    typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1);
944    typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1);
945    typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
946    ClosureType m_Closure;
947public:
948    // Typedefs to aid generic programming
949    typedef FastDelegate1 type;
950
951    // Construction and comparison functions
952    FastDelegate1() { clear(); }
953    FastDelegate1(const FastDelegate1 &x) {
954        m_Closure.CopyFrom(this, x.m_Closure); }
955    void operator = (const FastDelegate1 &x) {
956        m_Closure.CopyFrom(this, x.m_Closure); }
957    bool operator ==(const FastDelegate1 &x) const {
958        return m_Closure.IsEqual(x.m_Closure); }
959    bool operator !=(const FastDelegate1 &x) const {
960        return !m_Closure.IsEqual(x.m_Closure); }
961    bool operator <(const FastDelegate1 &x) const {
962        return m_Closure.IsLess(x.m_Closure); }
963    bool operator >(const FastDelegate1 &x) const {
964        return x.m_Closure.IsLess(m_Closure); }
965    // Binding to non-const member functions
966    template < class X, class Y >
967    FastDelegate1(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1) ) {
968        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
969    template < class X, class Y >
970    inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1)) {
971        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
972    // Binding to const member functions.
973    template < class X, class Y >
974    FastDelegate1(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1) const) {
975        m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind); }
976    template < class X, class Y >
977    inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1) const) {
978        m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind); }
979    // Static functions. We convert them into a member function call.
980    // This constructor also provides implicit conversion
981    FastDelegate1(DesiredRetType (*function_to_bind)(Param1 p1) ) {
982        bind(function_to_bind); }
983    // for efficiency, prevent creation of a temporary
984    void operator = (DesiredRetType (*function_to_bind)(Param1 p1) ) {
985        bind(function_to_bind); }
986    inline void bind(DesiredRetType (*function_to_bind)(Param1 p1)) {
987        m_Closure.bindstaticfunc(this, &FastDelegate1::InvokeStaticFunction,
988            function_to_bind); }
989    // Invoke the delegate
990    RetType operator() (Param1 p1) const {
991    return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(p1); }
992    // Implicit conversion to "bool" using the safe_bool idiom
993private:
994    typedef struct SafeBoolStruct {
995        int a_data_pointer_to_this_is_0_on_buggy_compilers;
996        StaticFunctionPtr m_nonzero;
997    } UselessTypedef;
998    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
999public:
1000    operator unspecified_bool_type() const {
1001        return empty()? 0: &SafeBoolStruct::m_nonzero;
1002    }
1003    // necessary to allow ==0 to work despite the safe_bool idiom
1004    inline bool operator==(StaticFunctionPtr funcptr) {
1005        return m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1006    inline bool operator!=(StaticFunctionPtr funcptr) {
1007        return !m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1008    inline bool operator ! () const { // Is it bound to anything?
1009            return !m_Closure; }
1010    inline bool empty() const {
1011            return !m_Closure; }
1012    void clear() { m_Closure.clear();}
1013    // Conversion to and from the DelegateMemento storage class
1014    const DelegateMemento & GetMemento() { return m_Closure; }
1015    void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }
1016
1017private: // Invoker for static functions
1018    RetType InvokeStaticFunction(Param1 p1) const {
1019    return (*(m_Closure.GetStaticFunction()))(p1); }
1020};
1021
1022//N=2
1023template<class Param1, class Param2, class RetType=detail::DefaultVoid>
1024class FastDelegate2 {
1025private:
1026    typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
1027    typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1, Param2 p2);
1028    typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1, Param2 p2);
1029    typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1, Param2 p2);
1030    typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
1031    ClosureType m_Closure;
1032public:
1033    // Typedefs to aid generic programming
1034    typedef FastDelegate2 type;
1035
1036    // Construction and comparison functions
1037    FastDelegate2() { clear(); }
1038    FastDelegate2(const FastDelegate2 &x) {
1039        m_Closure.CopyFrom(this, x.m_Closure); }
1040    void operator = (const FastDelegate2 &x) {
1041        m_Closure.CopyFrom(this, x.m_Closure); }
1042    bool operator ==(const FastDelegate2 &x) const {
1043        return m_Closure.IsEqual(x.m_Closure); }
1044    bool operator !=(const FastDelegate2 &x) const {
1045        return !m_Closure.IsEqual(x.m_Closure); }
1046    bool operator <(const FastDelegate2 &x) const {
1047        return m_Closure.IsLess(x.m_Closure); }
1048    bool operator >(const FastDelegate2 &x) const {
1049        return x.m_Closure.IsLess(m_Closure); }
1050    // Binding to non-const member functions
1051    template < class X, class Y >
1052    FastDelegate2(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2) ) {
1053        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1054    template < class X, class Y >
1055    inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2)) {
1056        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1057    // Binding to const member functions.
1058    template < class X, class Y >
1059    FastDelegate2(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2) const) {
1060        m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind); }
1061    template < class X, class Y >
1062    inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2) const) {
1063        m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind); }
1064    // Static functions. We convert them into a member function call.
1065    // This constructor also provides implicit conversion
1066    FastDelegate2(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2) ) {
1067        bind(function_to_bind); }
1068    // for efficiency, prevent creation of a temporary
1069    void operator = (DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2) ) {
1070        bind(function_to_bind); }
1071    inline void bind(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2)) {
1072        m_Closure.bindstaticfunc(this, &FastDelegate2::InvokeStaticFunction,
1073            function_to_bind); }
1074    // Invoke the delegate
1075    RetType operator() (Param1 p1, Param2 p2) const {
1076    return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(p1, p2); }
1077    // Implicit conversion to "bool" using the safe_bool idiom
1078private:
1079    typedef struct SafeBoolStruct {
1080        int a_data_pointer_to_this_is_0_on_buggy_compilers;
1081        StaticFunctionPtr m_nonzero;
1082    } UselessTypedef;
1083    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
1084public:
1085    operator unspecified_bool_type() const {
1086        return empty()? 0: &SafeBoolStruct::m_nonzero;
1087    }
1088    // necessary to allow ==0 to work despite the safe_bool idiom
1089    inline bool operator==(StaticFunctionPtr funcptr) {
1090        return m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1091    inline bool operator!=(StaticFunctionPtr funcptr) {
1092        return !m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1093    inline bool operator ! () const { // Is it bound to anything?
1094            return !m_Closure; }
1095    inline bool empty() const {
1096            return !m_Closure; }
1097    void clear() { m_Closure.clear();}
1098    // Conversion to and from the DelegateMemento storage class
1099    const DelegateMemento & GetMemento() { return m_Closure; }
1100    void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }
1101
1102private: // Invoker for static functions
1103    RetType InvokeStaticFunction(Param1 p1, Param2 p2) const {
1104    return (*(m_Closure.GetStaticFunction()))(p1, p2); }
1105};
1106
1107//N=3
1108template<class Param1, class Param2, class Param3, class RetType=detail::DefaultVoid>
1109class FastDelegate3 {
1110private:
1111    typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
1112    typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3);
1113    typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3);
1114    typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1, Param2 p2, Param3 p3);
1115    typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
1116    ClosureType m_Closure;
1117public:
1118    // Typedefs to aid generic programming
1119    typedef FastDelegate3 type;
1120
1121    // Construction and comparison functions
1122    FastDelegate3() { clear(); }
1123    FastDelegate3(const FastDelegate3 &x) {
1124        m_Closure.CopyFrom(this, x.m_Closure); }
1125    void operator = (const FastDelegate3 &x) {
1126        m_Closure.CopyFrom(this, x.m_Closure); }
1127    bool operator ==(const FastDelegate3 &x) const {
1128        return m_Closure.IsEqual(x.m_Closure); }
1129    bool operator !=(const FastDelegate3 &x) const {
1130        return !m_Closure.IsEqual(x.m_Closure); }
1131    bool operator <(const FastDelegate3 &x) const {
1132        return m_Closure.IsLess(x.m_Closure); }
1133    bool operator >(const FastDelegate3 &x) const {
1134        return x.m_Closure.IsLess(m_Closure); }
1135    // Binding to non-const member functions
1136    template < class X, class Y >
1137    FastDelegate3(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3) ) {
1138        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1139    template < class X, class Y >
1140    inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3)) {
1141        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1142    // Binding to const member functions.
1143    template < class X, class Y >
1144    FastDelegate3(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3) const) {
1145        m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind); }
1146    template < class X, class Y >
1147    inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3) const) {
1148        m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind); }
1149    // Static functions. We convert them into a member function call.
1150    // This constructor also provides implicit conversion
1151    FastDelegate3(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3) ) {
1152        bind(function_to_bind); }
1153    // for efficiency, prevent creation of a temporary
1154    void operator = (DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3) ) {
1155        bind(function_to_bind); }
1156    inline void bind(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3)) {
1157        m_Closure.bindstaticfunc(this, &FastDelegate3::InvokeStaticFunction,
1158            function_to_bind); }
1159    // Invoke the delegate
1160    RetType operator() (Param1 p1, Param2 p2, Param3 p3) const {
1161    return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(p1, p2, p3); }
1162    // Implicit conversion to "bool" using the safe_bool idiom
1163private:
1164    typedef struct SafeBoolStruct {
1165        int a_data_pointer_to_this_is_0_on_buggy_compilers;
1166        StaticFunctionPtr m_nonzero;
1167    } UselessTypedef;
1168    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
1169public:
1170    operator unspecified_bool_type() const {
1171        return empty()? 0: &SafeBoolStruct::m_nonzero;
1172    }
1173    // necessary to allow ==0 to work despite the safe_bool idiom
1174    inline bool operator==(StaticFunctionPtr funcptr) {
1175        return m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1176    inline bool operator!=(StaticFunctionPtr funcptr) {
1177        return !m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1178    inline bool operator ! () const { // Is it bound to anything?
1179            return !m_Closure; }
1180    inline bool empty() const {
1181            return !m_Closure; }
1182    void clear() { m_Closure.clear();}
1183    // Conversion to and from the DelegateMemento storage class
1184    const DelegateMemento & GetMemento() { return m_Closure; }
1185    void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }
1186
1187private: // Invoker for static functions
1188    RetType InvokeStaticFunction(Param1 p1, Param2 p2, Param3 p3) const {
1189    return (*(m_Closure.GetStaticFunction()))(p1, p2, p3); }
1190};
1191
1192//N=4
1193template<class Param1, class Param2, class Param3, class Param4, class RetType=detail::DefaultVoid>
1194class FastDelegate4 {
1195private:
1196    typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
1197    typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3, Param4 p4);
1198    typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3, Param4 p4);
1199    typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1, Param2 p2, Param3 p3, Param4 p4);
1200    typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
1201    ClosureType m_Closure;
1202public:
1203    // Typedefs to aid generic programming
1204    typedef FastDelegate4 type;
1205
1206    // Construction and comparison functions
1207    FastDelegate4() { clear(); }
1208    FastDelegate4(const FastDelegate4 &x) {
1209        m_Closure.CopyFrom(this, x.m_Closure); }
1210    void operator = (const FastDelegate4 &x) {
1211        m_Closure.CopyFrom(this, x.m_Closure); }
1212    bool operator ==(const FastDelegate4 &x) const {
1213        return m_Closure.IsEqual(x.m_Closure); }
1214    bool operator !=(const FastDelegate4 &x) const {
1215        return !m_Closure.IsEqual(x.m_Closure); }
1216    bool operator <(const FastDelegate4 &x) const {
1217        return m_Closure.IsLess(x.m_Closure); }
1218    bool operator >(const FastDelegate4 &x) const {
1219        return x.m_Closure.IsLess(m_Closure); }
1220    // Binding to non-const member functions
1221    template < class X, class Y >
1222    FastDelegate4(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4) ) {
1223        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1224    template < class X, class Y >
1225    inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4)) {
1226        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1227    // Binding to const member functions.
1228    template < class X, class Y >
1229    FastDelegate4(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4) const) {
1230        m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind); }
1231    template < class X, class Y >
1232    inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4) const) {
1233        m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind); }
1234    // Static functions. We convert them into a member function call.
1235    // This constructor also provides implicit conversion
1236    FastDelegate4(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4) ) {
1237        bind(function_to_bind); }
1238    // for efficiency, prevent creation of a temporary
1239    void operator = (DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4) ) {
1240        bind(function_to_bind); }
1241    inline void bind(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4)) {
1242        m_Closure.bindstaticfunc(this, &FastDelegate4::InvokeStaticFunction,
1243            function_to_bind); }
1244    // Invoke the delegate
1245    RetType operator() (Param1 p1, Param2 p2, Param3 p3, Param4 p4) const {
1246    return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(p1, p2, p3, p4); }
1247    // Implicit conversion to "bool" using the safe_bool idiom
1248private:
1249    typedef struct SafeBoolStruct {
1250        int a_data_pointer_to_this_is_0_on_buggy_compilers;
1251        StaticFunctionPtr m_nonzero;
1252    } UselessTypedef;
1253    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
1254public:
1255    operator unspecified_bool_type() const {
1256        return empty()? 0: &SafeBoolStruct::m_nonzero;
1257    }
1258    // necessary to allow ==0 to work despite the safe_bool idiom
1259    inline bool operator==(StaticFunctionPtr funcptr) {
1260        return m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1261    inline bool operator!=(StaticFunctionPtr funcptr) {
1262        return !m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1263    inline bool operator ! () const { // Is it bound to anything?
1264            return !m_Closure; }
1265    inline bool empty() const {
1266            return !m_Closure; }
1267    void clear() { m_Closure.clear();}
1268    // Conversion to and from the DelegateMemento storage class
1269    const DelegateMemento & GetMemento() { return m_Closure; }
1270    void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }
1271
1272private: // Invoker for static functions
1273    RetType InvokeStaticFunction(Param1 p1, Param2 p2, Param3 p3, Param4 p4) const {
1274    return (*(m_Closure.GetStaticFunction()))(p1, p2, p3, p4); }
1275};
1276
1277//N=5
1278template<class Param1, class Param2, class Param3, class Param4, class Param5, class RetType=detail::DefaultVoid>
1279class FastDelegate5 {
1280private:
1281    typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
1282    typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5);
1283    typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5);
1284    typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5);
1285    typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
1286    ClosureType m_Closure;
1287public:
1288    // Typedefs to aid generic programming
1289    typedef FastDelegate5 type;
1290
1291    // Construction and comparison functions
1292    FastDelegate5() { clear(); }
1293    FastDelegate5(const FastDelegate5 &x) {
1294        m_Closure.CopyFrom(this, x.m_Closure); }
1295    void operator = (const FastDelegate5 &x) {
1296        m_Closure.CopyFrom(this, x.m_Closure); }
1297    bool operator ==(const FastDelegate5 &x) const {
1298        return m_Closure.IsEqual(x.m_Closure); }
1299    bool operator !=(const FastDelegate5 &x) const {
1300        return !m_Closure.IsEqual(x.m_Closure); }
1301    bool operator <(const FastDelegate5 &x) const {
1302        return m_Closure.IsLess(x.m_Closure); }
1303    bool operator >(const FastDelegate5 &x) const {
1304        return x.m_Closure.IsLess(m_Closure); }
1305    // Binding to non-const member functions
1306    template < class X, class Y >
1307    FastDelegate5(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5) ) {
1308        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1309    template < class X, class Y >
1310    inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5)) {
1311        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1312    // Binding to const member functions.
1313    template < class X, class Y >
1314    FastDelegate5(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5) const) {
1315        m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind); }
1316    template < class X, class Y >
1317    inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5) const) {
1318        m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind); }
1319    // Static functions. We convert them into a member function call.
1320    // This constructor also provides implicit conversion
1321    FastDelegate5(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5) ) {
1322        bind(function_to_bind); }
1323    // for efficiency, prevent creation of a temporary
1324    void operator = (DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5) ) {
1325        bind(function_to_bind); }
1326    inline void bind(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5)) {
1327        m_Closure.bindstaticfunc(this, &FastDelegate5::InvokeStaticFunction,
1328            function_to_bind); }
1329    // Invoke the delegate
1330    RetType operator() (Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5) const {
1331    return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(p1, p2, p3, p4, p5); }
1332    // Implicit conversion to "bool" using the safe_bool idiom
1333private:
1334    typedef struct SafeBoolStruct {
1335        int a_data_pointer_to_this_is_0_on_buggy_compilers;
1336        StaticFunctionPtr m_nonzero;
1337    } UselessTypedef;
1338    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
1339public:
1340    operator unspecified_bool_type() const {
1341        return empty()? 0: &SafeBoolStruct::m_nonzero;
1342    }
1343    // necessary to allow ==0 to work despite the safe_bool idiom
1344    inline bool operator==(StaticFunctionPtr funcptr) {
1345        return m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1346    inline bool operator!=(StaticFunctionPtr funcptr) {
1347        return !m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1348    inline bool operator ! () const { // Is it bound to anything?
1349            return !m_Closure; }
1350    inline bool empty() const {
1351            return !m_Closure; }
1352    void clear() { m_Closure.clear();}
1353    // Conversion to and from the DelegateMemento storage class
1354    const DelegateMemento & GetMemento() { return m_Closure; }
1355    void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }
1356
1357private: // Invoker for static functions
1358    RetType InvokeStaticFunction(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5) const {
1359    return (*(m_Closure.GetStaticFunction()))(p1, p2, p3, p4, p5); }
1360};
1361
1362//N=6
1363template<class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class RetType=detail::DefaultVoid>
1364class FastDelegate6 {
1365private:
1366    typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
1367    typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6);
1368    typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6);
1369    typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6);
1370    typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
1371    ClosureType m_Closure;
1372public:
1373    // Typedefs to aid generic programming
1374    typedef FastDelegate6 type;
1375
1376    // Construction and comparison functions
1377    FastDelegate6() { clear(); }
1378    FastDelegate6(const FastDelegate6 &x) {
1379        m_Closure.CopyFrom(this, x.m_Closure); }
1380    void operator = (const FastDelegate6 &x) {
1381        m_Closure.CopyFrom(this, x.m_Closure); }
1382    bool operator ==(const FastDelegate6 &x) const {
1383        return m_Closure.IsEqual(x.m_Closure); }
1384    bool operator !=(const FastDelegate6 &x) const {
1385        return !m_Closure.IsEqual(x.m_Closure); }
1386    bool operator <(const FastDelegate6 &x) const {
1387        return m_Closure.IsLess(x.m_Closure); }
1388    bool operator >(const FastDelegate6 &x) const {
1389        return x.m_Closure.IsLess(m_Closure); }
1390    // Binding to non-const member functions
1391    template < class X, class Y >
1392    FastDelegate6(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6) ) {
1393        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1394    template < class X, class Y >
1395    inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6)) {
1396        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1397    // Binding to const member functions.
1398    template < class X, class Y >
1399    FastDelegate6(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6) const) {
1400        m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind); }
1401    template < class X, class Y >
1402    inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6) const) {
1403        m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind); }
1404    // Static functions. We convert them into a member function call.
1405    // This constructor also provides implicit conversion
1406    FastDelegate6(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6) ) {
1407        bind(function_to_bind); }
1408    // for efficiency, prevent creation of a temporary
1409    void operator = (DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6) ) {
1410        bind(function_to_bind); }
1411    inline void bind(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6)) {
1412        m_Closure.bindstaticfunc(this, &FastDelegate6::InvokeStaticFunction,
1413            function_to_bind); }
1414    // Invoke the delegate
1415    RetType operator() (Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6) const {
1416    return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(p1, p2, p3, p4, p5, p6); }
1417    // Implicit conversion to "bool" using the safe_bool idiom
1418private:
1419    typedef struct SafeBoolStruct {
1420        int a_data_pointer_to_this_is_0_on_buggy_compilers;
1421        StaticFunctionPtr m_nonzero;
1422    } UselessTypedef;
1423    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
1424public:
1425    operator unspecified_bool_type() const {
1426        return empty()? 0: &SafeBoolStruct::m_nonzero;
1427    }
1428    // necessary to allow ==0 to work despite the safe_bool idiom
1429    inline bool operator==(StaticFunctionPtr funcptr) {
1430        return m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1431    inline bool operator!=(StaticFunctionPtr funcptr) {
1432        return !m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1433    inline bool operator ! () const { // Is it bound to anything?
1434            return !m_Closure; }
1435    inline bool empty() const {
1436            return !m_Closure; }
1437    void clear() { m_Closure.clear();}
1438    // Conversion to and from the DelegateMemento storage class
1439    const DelegateMemento & GetMemento() { return m_Closure; }
1440    void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }
1441
1442private: // Invoker for static functions
1443    RetType InvokeStaticFunction(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6) const {
1444    return (*(m_Closure.GetStaticFunction()))(p1, p2, p3, p4, p5, p6); }
1445};
1446
1447//N=7
1448template<class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class Param7, class RetType=detail::DefaultVoid>
1449class FastDelegate7 {
1450private:
1451    typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
1452    typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7);
1453    typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7);
1454    typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7);
1455    typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
1456    ClosureType m_Closure;
1457public:
1458    // Typedefs to aid generic programming
1459    typedef FastDelegate7 type;
1460
1461    // Construction and comparison functions
1462    FastDelegate7() { clear(); }
1463    FastDelegate7(const FastDelegate7 &x) {
1464        m_Closure.CopyFrom(this, x.m_Closure); }
1465    void operator = (const FastDelegate7 &x) {
1466        m_Closure.CopyFrom(this, x.m_Closure); }
1467    bool operator ==(const FastDelegate7 &x) const {
1468        return m_Closure.IsEqual(x.m_Closure); }
1469    bool operator !=(const FastDelegate7 &x) const {
1470        return !m_Closure.IsEqual(x.m_Closure); }
1471    bool operator <(const FastDelegate7 &x) const {
1472        return m_Closure.IsLess(x.m_Closure); }
1473    bool operator >(const FastDelegate7 &x) const {
1474        return x.m_Closure.IsLess(m_Closure); }
1475    // Binding to non-const member functions
1476    template < class X, class Y >
1477    FastDelegate7(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7) ) {
1478        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1479    template < class X, class Y >
1480    inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7)) {
1481        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1482    // Binding to const member functions.
1483    template < class X, class Y >
1484    FastDelegate7(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7) const) {
1485        m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind); }
1486    template < class X, class Y >
1487    inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7) const) {
1488        m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind); }
1489    // Static functions. We convert them into a member function call.
1490    // This constructor also provides implicit conversion
1491    FastDelegate7(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7) ) {
1492        bind(function_to_bind); }
1493    // for efficiency, prevent creation of a temporary
1494    void operator = (DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7) ) {
1495        bind(function_to_bind); }
1496    inline void bind(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7)) {
1497        m_Closure.bindstaticfunc(this, &FastDelegate7::InvokeStaticFunction,
1498            function_to_bind); }
1499    // Invoke the delegate
1500    RetType operator() (Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7) const {
1501    return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(p1, p2, p3, p4, p5, p6, p7); }
1502    // Implicit conversion to "bool" using the safe_bool idiom
1503private:
1504    typedef struct SafeBoolStruct {
1505        int a_data_pointer_to_this_is_0_on_buggy_compilers;
1506        StaticFunctionPtr m_nonzero;
1507    } UselessTypedef;
1508    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
1509public:
1510    operator unspecified_bool_type() const {
1511        return empty()? 0: &SafeBoolStruct::m_nonzero;
1512    }
1513    // necessary to allow ==0 to work despite the safe_bool idiom
1514    inline bool operator==(StaticFunctionPtr funcptr) {
1515        return m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1516    inline bool operator!=(StaticFunctionPtr funcptr) {
1517        return !m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1518    inline bool operator ! () const { // Is it bound to anything?
1519            return !m_Closure; }
1520    inline bool empty() const {
1521            return !m_Closure; }
1522    void clear() { m_Closure.clear();}
1523    // Conversion to and from the DelegateMemento storage class
1524    const DelegateMemento & GetMemento() { return m_Closure; }
1525    void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }
1526
1527private: // Invoker for static functions
1528    RetType InvokeStaticFunction(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7) const {
1529    return (*(m_Closure.GetStaticFunction()))(p1, p2, p3, p4, p5, p6, p7); }
1530};
1531
1532//N=8
1533template<class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class Param7, class Param8, class RetType=detail::DefaultVoid>
1534class FastDelegate8 {
1535private:
1536    typedef typename detail::DefaultVoidToVoid<RetType>::type DesiredRetType;
1537    typedef DesiredRetType (*StaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8);
1538    typedef RetType (*UnvoidStaticFunctionPtr)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8);
1539    typedef RetType (detail::GenericClass::*GenericMemFn)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8);
1540    typedef detail::ClosurePtr<GenericMemFn, StaticFunctionPtr, UnvoidStaticFunctionPtr> ClosureType;
1541    ClosureType m_Closure;
1542public:
1543    // Typedefs to aid generic programming
1544    typedef FastDelegate8 type;
1545
1546    // Construction and comparison functions
1547    FastDelegate8() { clear(); }
1548    FastDelegate8(const FastDelegate8 &x) {
1549        m_Closure.CopyFrom(this, x.m_Closure); }
1550    void operator = (const FastDelegate8 &x) {
1551        m_Closure.CopyFrom(this, x.m_Closure); }
1552    bool operator ==(const FastDelegate8 &x) const {
1553        return m_Closure.IsEqual(x.m_Closure); }
1554    bool operator !=(const FastDelegate8 &x) const {
1555        return !m_Closure.IsEqual(x.m_Closure); }
1556    bool operator <(const FastDelegate8 &x) const {
1557        return m_Closure.IsLess(x.m_Closure); }
1558    bool operator >(const FastDelegate8 &x) const {
1559        return x.m_Closure.IsLess(m_Closure); }
1560    // Binding to non-const member functions
1561    template < class X, class Y >
1562    FastDelegate8(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8) ) {
1563        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1564    template < class X, class Y >
1565    inline void bind(Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8)) {
1566        m_Closure.bindmemfunc(detail::implicit_cast<X*>(pthis), function_to_bind); }
1567    // Binding to const member functions.
1568    template < class X, class Y >
1569    FastDelegate8(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8) const) {
1570        m_Closure.bindconstmemfunc(detail::implicit_cast<const X*>(pthis), function_to_bind); }
1571    template < class X, class Y >
1572    inline void bind(const Y *pthis, DesiredRetType (X::* function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8) const) {
1573        m_Closure.bindconstmemfunc(detail::implicit_cast<const X *>(pthis), function_to_bind); }
1574    // Static functions. We convert them into a member function call.
1575    // This constructor also provides implicit conversion
1576    FastDelegate8(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8) ) {
1577        bind(function_to_bind); }
1578    // for efficiency, prevent creation of a temporary
1579    void operator = (DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8) ) {
1580        bind(function_to_bind); }
1581    inline void bind(DesiredRetType (*function_to_bind)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8)) {
1582        m_Closure.bindstaticfunc(this, &FastDelegate8::InvokeStaticFunction,
1583            function_to_bind); }
1584    // Invoke the delegate
1585    RetType operator() (Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8) const {
1586    return (m_Closure.GetClosureThis()->*(m_Closure.GetClosureMemPtr()))(p1, p2, p3, p4, p5, p6, p7, p8); }
1587    // Implicit conversion to "bool" using the safe_bool idiom
1588private:
1589    typedef struct SafeBoolStruct {
1590        int a_data_pointer_to_this_is_0_on_buggy_compilers;
1591        StaticFunctionPtr m_nonzero;
1592    } UselessTypedef;
1593    typedef StaticFunctionPtr SafeBoolStruct::*unspecified_bool_type;
1594public:
1595    operator unspecified_bool_type() const {
1596        return empty()? 0: &SafeBoolStruct::m_nonzero;
1597    }
1598    // necessary to allow ==0 to work despite the safe_bool idiom
1599    inline bool operator==(StaticFunctionPtr funcptr) {
1600        return m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1601    inline bool operator!=(StaticFunctionPtr funcptr) {
1602        return !m_Closure.IsEqualToStaticFuncPtr(funcptr); }
1603    inline bool operator ! () const { // Is it bound to anything?
1604            return !m_Closure; }
1605    inline bool empty() const {
1606            return !m_Closure; }
1607    void clear() { m_Closure.clear();}
1608    // Conversion to and from the DelegateMemento storage class
1609    const DelegateMemento & GetMemento() { return m_Closure; }
1610    void SetMemento(const DelegateMemento &any) { m_Closure.CopyFrom(this, any); }
1611
1612private: // Invoker for static functions
1613    RetType InvokeStaticFunction(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8) const {
1614    return (*(m_Closure.GetStaticFunction()))(p1, p2, p3, p4, p5, p6, p7, p8); }
1615};
1616
1617
1618////////////////////////////////////////////////////////////////////////////////
1619// Fast Delegates, part 4:
1620//
1621// FastDelegate<> class (Original author: Jody Hagins)
1622// Allows boost::function style syntax like:
1623// FastDelegate< double (int, long) >
1624// instead of:
1625// FastDelegate2< int, long, double >
1626//
1627////////////////////////////////////////////////////////////////////////////////
1628
1629#ifdef FASTDELEGATE_ALLOW_FUNCTION_TYPE_SYNTAX
1630
1631// Declare FastDelegate as a class template. It will be specialized
1632// later for all number of arguments.
1633template <typename Signature>
1634class FastDelegate;
1635
1636//N=0
1637// Specialization to allow use of
1638// FastDelegate< R ( ) >
1639// instead of
1640// FastDelegate0 < R >
1641template<typename R>
1642class FastDelegate< R ( ) >
1643  // Inherit from FastDelegate0 so that it can be treated just like a FastDelegate0
1644  : public FastDelegate0 < R >
1645{
1646public:
1647  // Make using the base type a bit easier via typedef.
1648  typedef FastDelegate0 < R > BaseType;
1649
1650  // Allow users access to the specific type of this delegate.
1651  typedef FastDelegate SelfType;
1652
1653  // Mimic the base class constructors.
1654  FastDelegate() : BaseType() { }
1655
1656  template < class X, class Y >
1657  FastDelegate(Y * pthis,
1658    R (X::* function_to_bind)( ))
1659    : BaseType(pthis, function_to_bind) { }
1660
1661  template < class X, class Y >
1662  FastDelegate(const Y *pthis,
1663      R (X::* function_to_bind)( ) const)
1664    : BaseType(pthis, function_to_bind)
1665  { }
1666
1667  FastDelegate(R (*function_to_bind)( ))
1668    : BaseType(function_to_bind) { }
1669  void operator = (const BaseType &x) {
1670        *static_cast<BaseType*>(this) = x; }
1671};
1672
1673//N=1
1674// Specialization to allow use of
1675// FastDelegate< R ( Param1 ) >
1676// instead of
1677// FastDelegate1 < Param1, R >
1678template<typename R, class Param1>
1679class FastDelegate< R ( Param1 ) >
1680  // Inherit from FastDelegate1 so that it can be treated just like a FastDelegate1
1681  : public FastDelegate1 < Param1, R >
1682{
1683public:
1684  // Make using the base type a bit easier via typedef.
1685  typedef FastDelegate1 < Param1, R > BaseType;
1686
1687  // Allow users access to the specific type of this delegate.
1688  typedef FastDelegate SelfType;
1689
1690  // Mimic the base class constructors.
1691  FastDelegate() : BaseType() { }
1692
1693  template < class X, class Y >
1694  FastDelegate(Y * pthis,
1695    R (X::* function_to_bind)( Param1 p1 ))
1696    : BaseType(pthis, function_to_bind) { }
1697
1698  template < class X, class Y >
1699  FastDelegate(const Y *pthis,
1700      R (X::* function_to_bind)( Param1 p1 ) const)
1701    : BaseType(pthis, function_to_bind)
1702  { }
1703
1704  FastDelegate(R (*function_to_bind)( Param1 p1 ))
1705    : BaseType(function_to_bind) { }
1706  void operator = (const BaseType &x) {
1707        *static_cast<BaseType*>(this) = x; }
1708};
1709
1710//N=2
1711// Specialization to allow use of
1712// FastDelegate< R ( Param1, Param2 ) >
1713// instead of
1714// FastDelegate2 < Param1, Param2, R >
1715template<typename R, class Param1, class Param2>
1716class FastDelegate< R ( Param1, Param2 ) >
1717  // Inherit from FastDelegate2 so that it can be treated just like a FastDelegate2
1718  : public FastDelegate2 < Param1, Param2, R >
1719{
1720public:
1721  // Make using the base type a bit easier via typedef.
1722  typedef FastDelegate2 < Param1, Param2, R > BaseType;
1723
1724  // Allow users access to the specific type of this delegate.
1725  typedef FastDelegate SelfType;
1726
1727  // Mimic the base class constructors.
1728  FastDelegate() : BaseType() { }
1729
1730  template < class X, class Y >
1731  FastDelegate(Y * pthis,
1732    R (X::* function_to_bind)( Param1 p1, Param2 p2 ))
1733    : BaseType(pthis, function_to_bind) { }
1734
1735  template < class X, class Y >
1736  FastDelegate(const Y *pthis,
1737      R (X::* function_to_bind)( Param1 p1, Param2 p2 ) const)
1738    : BaseType(pthis, function_to_bind)
1739  { }
1740
1741  FastDelegate(R (*function_to_bind)( Param1 p1, Param2 p2 ))
1742    : BaseType(function_to_bind) { }
1743  void operator = (const BaseType &x) {
1744        *static_cast<BaseType*>(this) = x; }
1745};
1746
1747//N=3
1748// Specialization to allow use of
1749// FastDelegate< R ( Param1, Param2, Param3 ) >
1750// instead of
1751// FastDelegate3 < Param1, Param2, Param3, R >
1752template<typename R, class Param1, class Param2, class Param3>
1753class FastDelegate< R ( Param1, Param2, Param3 ) >
1754  // Inherit from FastDelegate3 so that it can be treated just like a FastDelegate3
1755  : public FastDelegate3 < Param1, Param2, Param3, R >
1756{
1757public:
1758  // Make using the base type a bit easier via typedef.
1759  typedef FastDelegate3 < Param1, Param2, Param3, R > BaseType;
1760
1761  // Allow users access to the specific type of this delegate.
1762  typedef FastDelegate SelfType;
1763
1764  // Mimic the base class constructors.
1765  FastDelegate() : BaseType() { }
1766
1767  template < class X, class Y >
1768  FastDelegate(Y * pthis,
1769    R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3 ))
1770    : BaseType(pthis, function_to_bind) { }
1771
1772  template < class X, class Y >
1773  FastDelegate(const Y *pthis,
1774      R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3 ) const)
1775    : BaseType(pthis, function_to_bind)
1776  { }
1777
1778  FastDelegate(R (*function_to_bind)( Param1 p1, Param2 p2, Param3 p3 ))
1779    : BaseType(function_to_bind) { }
1780  void operator = (const BaseType &x) {
1781        *static_cast<BaseType*>(this) = x; }
1782};
1783
1784//N=4
1785// Specialization to allow use of
1786// FastDelegate< R ( Param1, Param2, Param3, Param4 ) >
1787// instead of
1788// FastDelegate4 < Param1, Param2, Param3, Param4, R >
1789template<typename R, class Param1, class Param2, class Param3, class Param4>
1790class FastDelegate< R ( Param1, Param2, Param3, Param4 ) >
1791  // Inherit from FastDelegate4 so that it can be treated just like a FastDelegate4
1792  : public FastDelegate4 < Param1, Param2, Param3, Param4, R >
1793{
1794public:
1795  // Make using the base type a bit easier via typedef.
1796  typedef FastDelegate4 < Param1, Param2, Param3, Param4, R > BaseType;
1797
1798  // Allow users access to the specific type of this delegate.
1799  typedef FastDelegate SelfType;
1800
1801  // Mimic the base class constructors.
1802  FastDelegate() : BaseType() { }
1803
1804  template < class X, class Y >
1805  FastDelegate(Y * pthis,
1806    R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4 ))
1807    : BaseType(pthis, function_to_bind) { }
1808
1809  template < class X, class Y >
1810  FastDelegate(const Y *pthis,
1811      R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4 ) const)
1812    : BaseType(pthis, function_to_bind)
1813  { }
1814
1815  FastDelegate(R (*function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4 ))
1816    : BaseType(function_to_bind) { }
1817  void operator = (const BaseType &x) {
1818        *static_cast<BaseType*>(this) = x; }
1819};
1820
1821//N=5
1822// Specialization to allow use of
1823// FastDelegate< R ( Param1, Param2, Param3, Param4, Param5 ) >
1824// instead of
1825// FastDelegate5 < Param1, Param2, Param3, Param4, Param5, R >
1826template<typename R, class Param1, class Param2, class Param3, class Param4, class Param5>
1827class FastDelegate< R ( Param1, Param2, Param3, Param4, Param5 ) >
1828  // Inherit from FastDelegate5 so that it can be treated just like a FastDelegate5
1829  : public FastDelegate5 < Param1, Param2, Param3, Param4, Param5, R >
1830{
1831public:
1832  // Make using the base type a bit easier via typedef.
1833  typedef FastDelegate5 < Param1, Param2, Param3, Param4, Param5, R > BaseType;
1834
1835  // Allow users access to the specific type of this delegate.
1836  typedef FastDelegate SelfType;
1837
1838  // Mimic the base class constructors.
1839  FastDelegate() : BaseType() { }
1840
1841  template < class X, class Y >
1842  FastDelegate(Y * pthis,
1843    R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5 ))
1844    : BaseType(pthis, function_to_bind) { }
1845
1846  template < class X, class Y >
1847  FastDelegate(const Y *pthis,
1848      R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5 ) const)
1849    : BaseType(pthis, function_to_bind)
1850  { }
1851
1852  FastDelegate(R (*function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5 ))
1853    : BaseType(function_to_bind) { }
1854  void operator = (const BaseType &x) {
1855        *static_cast<BaseType*>(this) = x; }
1856};
1857
1858//N=6
1859// Specialization to allow use of
1860// FastDelegate< R ( Param1, Param2, Param3, Param4, Param5, Param6 ) >
1861// instead of
1862// FastDelegate6 < Param1, Param2, Param3, Param4, Param5, Param6, R >
1863template<typename R, class Param1, class Param2, class Param3, class Param4, class Param5, class Param6>
1864class FastDelegate< R ( Param1, Param2, Param3, Param4, Param5, Param6 ) >
1865  // Inherit from FastDelegate6 so that it can be treated just like a FastDelegate6
1866  : public FastDelegate6 < Param1, Param2, Param3, Param4, Param5, Param6, R >
1867{
1868public:
1869  // Make using the base type a bit easier via typedef.
1870  typedef FastDelegate6 < Param1, Param2, Param3, Param4, Param5, Param6, R > BaseType;
1871
1872  // Allow users access to the specific type of this delegate.
1873  typedef FastDelegate SelfType;
1874
1875  // Mimic the base class constructors.
1876  FastDelegate() : BaseType() { }
1877
1878  template < class X, class Y >
1879  FastDelegate(Y * pthis,
1880    R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6 ))
1881    : BaseType(pthis, function_to_bind) { }
1882
1883  template < class X, class Y >
1884  FastDelegate(const Y *pthis,
1885      R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6 ) const)
1886    : BaseType(pthis, function_to_bind)
1887  { }
1888
1889  FastDelegate(R (*function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6 ))
1890    : BaseType(function_to_bind) { }
1891  void operator = (const BaseType &x) {
1892        *static_cast<BaseType*>(this) = x; }
1893};
1894
1895//N=7
1896// Specialization to allow use of
1897// FastDelegate< R ( Param1, Param2, Param3, Param4, Param5, Param6, Param7 ) >
1898// instead of
1899// FastDelegate7 < Param1, Param2, Param3, Param4, Param5, Param6, Param7, R >
1900template<typename R, class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class Param7>
1901class FastDelegate< R ( Param1, Param2, Param3, Param4, Param5, Param6, Param7 ) >
1902  // Inherit from FastDelegate7 so that it can be treated just like a FastDelegate7
1903  : public FastDelegate7 < Param1, Param2, Param3, Param4, Param5, Param6, Param7, R >
1904{
1905public:
1906  // Make using the base type a bit easier via typedef.
1907  typedef FastDelegate7 < Param1, Param2, Param3, Param4, Param5, Param6, Param7, R > BaseType;
1908
1909  // Allow users access to the specific type of this delegate.
1910  typedef FastDelegate SelfType;
1911
1912  // Mimic the base class constructors.
1913  FastDelegate() : BaseType() { }
1914
1915  template < class X, class Y >
1916  FastDelegate(Y * pthis,
1917    R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7 ))
1918    : BaseType(pthis, function_to_bind) { }
1919
1920  template < class X, class Y >
1921  FastDelegate(const Y *pthis,
1922      R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7 ) const)
1923    : BaseType(pthis, function_to_bind)
1924  { }
1925
1926  FastDelegate(R (*function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7 ))
1927    : BaseType(function_to_bind) { }
1928  void operator = (const BaseType &x) {
1929        *static_cast<BaseType*>(this) = x; }
1930};
1931
1932//N=8
1933// Specialization to allow use of
1934// FastDelegate< R ( Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8 ) >
1935// instead of
1936// FastDelegate8 < Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, R >
1937template<typename R, class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class Param7, class Param8>
1938class FastDelegate< R ( Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8 ) >
1939  // Inherit from FastDelegate8 so that it can be treated just like a FastDelegate8
1940  : public FastDelegate8 < Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, R >
1941{
1942public:
1943  // Make using the base type a bit easier via typedef.
1944  typedef FastDelegate8 < Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, R > BaseType;
1945
1946  // Allow users access to the specific type of this delegate.
1947  typedef FastDelegate SelfType;
1948
1949  // Mimic the base class constructors.
1950  FastDelegate() : BaseType() { }
1951
1952  template < class X, class Y >
1953  FastDelegate(Y * pthis,
1954    R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8 ))
1955    : BaseType(pthis, function_to_bind) { }
1956
1957  template < class X, class Y >
1958  FastDelegate(const Y *pthis,
1959      R (X::* function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8 ) const)
1960    : BaseType(pthis, function_to_bind)
1961  { }
1962
1963  FastDelegate(R (*function_to_bind)( Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8 ))
1964    : BaseType(function_to_bind) { }
1965  void operator = (const BaseType &x) {
1966        *static_cast<BaseType*>(this) = x; }
1967};
1968
1969
1970#endif //FASTDELEGATE_ALLOW_FUNCTION_TYPE_SYNTAX
1971
1972////////////////////////////////////////////////////////////////////////////////
1973// Fast Delegates, part 5:
1974//
1975// MakeDelegate() helper function
1976//
1977// MakeDelegate(&x, &X::func) returns a fastdelegate of the type
1978// necessary for calling x.func() with the correct number of arguments.
1979// This makes it possible to eliminate many typedefs from user code.
1980//
1981////////////////////////////////////////////////////////////////////////////////
1982
1983// Also declare overloads of a MakeDelegate() global function to
1984// reduce the need for typedefs.
1985// We need seperate overloads for const and non-const member functions.
1986// Also, because of the weird rule about the class of derived member function pointers,
1987// implicit downcasts may need to be applied later to the 'this' pointer.
1988// That's why two classes (X and Y) appear in the definitions. Y must be implicitly
1989// castable to X.
1990
1991// Workaround for VC6. VC6 needs void return types converted into DefaultVoid.
1992// GCC 3.2 and later won't compile this unless it's preceded by 'typename',
1993// but VC6 doesn't allow 'typename' in this context.
1994// So, I have to use a macro.
1995
1996#ifdef FASTDLGT_VC6
1997#define FASTDLGT_RETTYPE detail::VoidToDefaultVoid<RetType>::type
1998#else
1999#define FASTDLGT_RETTYPE RetType
2000#endif
2001
2002//N=0
2003template <class X, class Y, class RetType>
2004FastDelegate0<FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)()) {
2005    return FastDelegate0<FASTDLGT_RETTYPE>(x, func);
2006}
2007
2008template <class X, class Y, class RetType>
2009FastDelegate0<FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)() const) {
2010    return FastDelegate0<FASTDLGT_RETTYPE>(x, func);
2011}
2012
2013//N=1
2014template <class X, class Y, class Param1, class RetType>
2015FastDelegate1<Param1, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1)) {
2016    return FastDelegate1<Param1, FASTDLGT_RETTYPE>(x, func);
2017}
2018
2019template <class X, class Y, class Param1, class RetType>
2020FastDelegate1<Param1, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1) const) {
2021    return FastDelegate1<Param1, FASTDLGT_RETTYPE>(x, func);
2022}
2023
2024//N=2
2025template <class X, class Y, class Param1, class Param2, class RetType>
2026FastDelegate2<Param1, Param2, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2)) {
2027    return FastDelegate2<Param1, Param2, FASTDLGT_RETTYPE>(x, func);
2028}
2029
2030template <class X, class Y, class Param1, class Param2, class RetType>
2031FastDelegate2<Param1, Param2, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2) const) {
2032    return FastDelegate2<Param1, Param2, FASTDLGT_RETTYPE>(x, func);
2033}
2034
2035//N=3
2036template <class X, class Y, class Param1, class Param2, class Param3, class RetType>
2037FastDelegate3<Param1, Param2, Param3, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3)) {
2038    return FastDelegate3<Param1, Param2, Param3, FASTDLGT_RETTYPE>(x, func);
2039}
2040
2041template <class X, class Y, class Param1, class Param2, class Param3, class RetType>
2042FastDelegate3<Param1, Param2, Param3, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3) const) {
2043    return FastDelegate3<Param1, Param2, Param3, FASTDLGT_RETTYPE>(x, func);
2044}
2045
2046//N=4
2047template <class X, class Y, class Param1, class Param2, class Param3, class Param4, class RetType>
2048FastDelegate4<Param1, Param2, Param3, Param4, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3, Param4 p4)) {
2049    return FastDelegate4<Param1, Param2, Param3, Param4, FASTDLGT_RETTYPE>(x, func);
2050}
2051
2052template <class X, class Y, class Param1, class Param2, class Param3, class Param4, class RetType>
2053FastDelegate4<Param1, Param2, Param3, Param4, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3, Param4 p4) const) {
2054    return FastDelegate4<Param1, Param2, Param3, Param4, FASTDLGT_RETTYPE>(x, func);
2055}
2056
2057//N=5
2058template <class X, class Y, class Param1, class Param2, class Param3, class Param4, class Param5, class RetType>
2059FastDelegate5<Param1, Param2, Param3, Param4, Param5, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5)) {
2060    return FastDelegate5<Param1, Param2, Param3, Param4, Param5, FASTDLGT_RETTYPE>(x, func);
2061}
2062
2063template <class X, class Y, class Param1, class Param2, class Param3, class Param4, class Param5, class RetType>
2064FastDelegate5<Param1, Param2, Param3, Param4, Param5, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5) const) {
2065    return FastDelegate5<Param1, Param2, Param3, Param4, Param5, FASTDLGT_RETTYPE>(x, func);
2066}
2067
2068//N=6
2069template <class X, class Y, class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class RetType>
2070FastDelegate6<Param1, Param2, Param3, Param4, Param5, Param6, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6)) {
2071    return FastDelegate6<Param1, Param2, Param3, Param4, Param5, Param6, FASTDLGT_RETTYPE>(x, func);
2072}
2073
2074template <class X, class Y, class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class RetType>
2075FastDelegate6<Param1, Param2, Param3, Param4, Param5, Param6, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6) const) {
2076    return FastDelegate6<Param1, Param2, Param3, Param4, Param5, Param6, FASTDLGT_RETTYPE>(x, func);
2077}
2078
2079//N=7
2080template <class X, class Y, class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class Param7, class RetType>
2081FastDelegate7<Param1, Param2, Param3, Param4, Param5, Param6, Param7, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7)) {
2082    return FastDelegate7<Param1, Param2, Param3, Param4, Param5, Param6, Param7, FASTDLGT_RETTYPE>(x, func);
2083}
2084
2085template <class X, class Y, class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class Param7, class RetType>
2086FastDelegate7<Param1, Param2, Param3, Param4, Param5, Param6, Param7, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7) const) {
2087    return FastDelegate7<Param1, Param2, Param3, Param4, Param5, Param6, Param7, FASTDLGT_RETTYPE>(x, func);
2088}
2089
2090//N=8
2091template <class X, class Y, class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class Param7, class Param8, class RetType>
2092FastDelegate8<Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8)) {
2093    return FastDelegate8<Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, FASTDLGT_RETTYPE>(x, func);
2094}
2095
2096template <class X, class Y, class Param1, class Param2, class Param3, class Param4, class Param5, class Param6, class Param7, class Param8, class RetType>
2097FastDelegate8<Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, FASTDLGT_RETTYPE> MakeDelegate(Y* x, RetType (X::*func)(Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8) const) {
2098    return FastDelegate8<Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, FASTDLGT_RETTYPE>(x, func);
2099}
2100
2101
2102 // clean up after ourselves...
2103#undef FASTDLGT_RETTYPE
2104
2105} // namespace fastdelegate
2106
2107#endif // !defined(FASTDELEGATE_H)
2108
2109

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