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  1. #include <iostream>
  2. #include <vector>
  3. #include <utility>
  4. #include <algorithm>
  5.  
  6. template<typename TFuncSignature>
  7. class Callback;
  8.  
  9. template<typename R, typename... Args>
  10. class Callback<R(Args...)> {
  11. public:
  12. 	typedef R(*TFunc)(void*, Args...);
  13.  
  14. 	Callback() : obj(0), func(0) {}
  15. 	Callback(void* o, TFunc f) : obj(o), func(f) {}
  16.  
  17. 	R operator()(Args... a) const {
  18. 		return (*func)(obj, std::forward<Args>(a)...);
  19. 	}
  20. 	typedef void* Callback::*SafeBoolType;
  21. 	operator SafeBoolType() const {
  22. 		return func? &Callback::obj : 0;
  23. 	}
  24. 	bool operator!() const {
  25. 		return func == 0;
  26. 	}
  27. 	bool operator== (const Callback<R (Args...)>& right) const {
  28. 		return obj == right.obj && func == right.func;
  29. 	}
  30. 	bool operator!= (const Callback<R (Args...)>& right) const {
  31. 		return obj != right.obj || func != right.func;
  32. 	}
  33. private:
  34. 	void* obj;
  35. 	TFunc func;
  36. };
  37.  
  38. namespace detail {
  39. 	template<typename R, class T, typename... Args>
  40. 	struct DeduceConstMemCallback { 
  41. 		template<R(T::*Func)(Args...) const> inline static Callback<R(Args...)> Bind(T* o) {
  42. 			struct _ { static R wrapper(void* o, Args... a) { return (static_cast<T*>(o)->*Func)(std::forward<Args>(a)...); } };
  43. 			return Callback<R(Args...)>(o, (R(*)(void*, Args...)) _::wrapper);
  44. 		}
  45. 	};
  46.  
  47. 	template<typename R, class T, typename... Args>
  48.     struct DeduceMemCallback { 
  49. 		template<R(T::*Func)(Args...)> inline static Callback<R(Args...)> Bind(T* o) {
  50. 			struct _ { static R wrapper(void* o, Args... a) { return (static_cast<T*>(o)->*Func)(std::forward<Args>(a)...); } };
  51. 			return Callback<R(Args...)>(o, (R(*)(void*, Args...)) _::wrapper);
  52. 		}
  53. 	};
  54.  
  55. 	template<typename R, typename... Args>
  56. 	struct DeduceStaticCallback { 
  57. 		template<R(*Func)(Args...)> inline static Callback<R(Args...)> Bind() { 
  58. 			struct _ { static R wrapper(void*, Args... a) { return (*Func)(std::forward<Args>(a)...); } };
  59. 			return Callback<R(Args...)>(0, (R(*)(void*, Args...)) _::wrapper); 
  60. 		}
  61. 	};
  62. }
  63.  
  64. template<typename R, class T, typename... Args>
  65. detail::DeduceConstMemCallback<R, T, Args...> DeduceCallback(R(T::*)(Args...) const) {
  66.     return detail::DeduceConstMemCallback<R, T, Args...>();
  67. }
  68.  
  69. template<typename R, class T, typename... Args>
  70. detail::DeduceMemCallback<R, T, Args...> DeduceCallback(R(T::*)(Args...)) {
  71. 	return detail::DeduceMemCallback<R, T, Args...>();
  72. }
  73.  
  74. template<typename R, typename... Args>
  75. detail::DeduceStaticCallback<R, Args...> DeduceCallback(R(*)(Args...)) {
  76. 	return detail::DeduceStaticCallback<R, Args...>();
  77. }
  78.  
  79. template <typename... T1> class Event {
  80. public:
  81. 	typedef void(*TSignature)(T1...);
  82. 	typedef Callback<void(T1...)> TCallback;
  83. 	typedef std::vector<TCallback> InvocationTable;
  84.  
  85. protected:
  86. 	InvocationTable invocations;
  87.  
  88. public:
  89. 	const static int ExpectedFunctorCount = 2;
  90.  
  91. 	Event() : invocations() {
  92. 		invocations.reserve(ExpectedFunctorCount);
  93. 	}
  94.  
  95. 	template <void (* TFunc)(T1...)> void Add() {
  96. 		TCallback c = DeduceCallback(TFunc).template Bind<TFunc>();
  97. 		invocations.push_back(c);
  98. 	}
  99.  
  100. 	template <typename T, void (T::* TFunc)(T1...)> void Add(T& object) {
  101. 		Add<T, TFunc>(&object);
  102. 	}
  103.  
  104. 	template <typename T, void (T::* TFunc)(T1...)> void Add(T* object) {
  105. 		TCallback c = DeduceCallback(TFunc).template Bind<TFunc>(object);
  106. 		invocations.push_back(c);
  107. 	}
  108.  
  109. 	template <typename T, void (T::* TFunc)(T1...) const> void Add(T& object) {
  110. 		Add<T, TFunc>(&object);
  111. 	}
  112.  
  113. 	template <typename T, void (T::* TFunc)(T1...) const> void Add(T* object) {
  114. 		TCallback c = DeduceCallback(TFunc).template Bind<TFunc>(object);
  115. 		invocations.push_back(c);
  116. 	}
  117.  
  118. 	void Invoke(T1... t1) {
  119. 		for(size_t i = 0; i < invocations.size() ; ++i) invocations[i](std::forward<T1>(t1)...); 
  120. 	}
  121.  
  122. 	void operator()(T1... t1) {
  123. 		Invoke(std::forward<T1>(t1)...);
  124. 	}
  125.  
  126. 	size_t InvocationCount() { return invocations.size(); }
  127.  
  128. 	template <void (* TFunc)(T1...)> bool Remove ()          
  129. 	{ return Remove (DeduceCallback(TFunc).template Bind<TFunc>()); } 
  130. 	template <typename T, void (T::* TFunc)(T1...)> bool Remove (T& object) 
  131. 	{ return Remove <T, TFunc>(&object); } 
  132. 	template <typename T, void (T::* TFunc)(T1...)> bool Remove (T* object) 
  133. 	{ return Remove (DeduceCallback(TFunc).template Bind<TFunc>(object)); } 
  134. 	template <typename T, void (T::* TFunc)(T1...) const> bool Remove (T& object) 
  135. 	{ return Remove <T, TFunc>(&object); } 
  136. 	template <typename T, void (T::* TFunc)(T1...) const> bool Remove (T* object) 
  137. 	{ return Remove (DeduceCallback(TFunc).template Bind<TFunc>(object)); } 
  138.  
  139. protected:
  140. 	bool Remove( TCallback const& target ) {
  141. 		auto it = std::find(invocations.begin(), invocations.end(), target);
  142. 		if (it == invocations.end()) 
  143. 			return false;
  144. 		invocations.erase(it);
  145. 		return true;
  146. 	}
  147. };
  148.  
  149. namespace IntStatic {
  150.         void VoidTest ( ) {
  151.                 std::cout << "INTO THE VOID"         << std::endl;
  152.         }
  153.         void IntTest ( int num ) {
  154.                 std::cout << "Got myself a "         << num  << " !"    << std::endl;
  155.         }
  156.         void IntTest2 ( int num ) {
  157.                 std::cout << "Now _I_ Got myself a " << num  << " !"    << std::endl;
  158.         }
  159. }
  160.  
  161. struct Int {
  162.         void Test ( int num ) {
  163.                 std::cout << num  << " on the inside of a class... ?"   << std::endl;
  164.         }
  165.         void Test2 ( int num ) {
  166.                 std::cout << num  << " on the inside of a struct, yo !" << std::endl;
  167.         }
  168.         static void Test3 ( int snum ) {
  169.                 std::cout << snum << " on the inside of a STATIC method?!"   << std::endl;
  170.         }
  171. };
  172.  
  173. struct Multi {
  174.         void Test ( std::string woo, std::string yeah ) {
  175.                 std::cout << "Dat Multi Member Function: ";
  176.                 std::cout << woo << " | " << yeah  << std::endl;
  177.         }
  178.  
  179.         void static Test2 ( std::string woo, std::string yeah ) {
  180.                 std::cout << "Dat Static Multi Function: ";
  181.                 std::cout << woo << " | " << yeah  << std::endl;
  182.         }
  183. };
  184.  
  185. int main ( int argc, char* argv[] ) {
  186.  
  187.     Event<int> intev;
  188.     Int i;
  189.     Multi m;
  190.  
  191.     intev.Add<Int, &Int::Test>(i);
  192.     intev.Add<&IntStatic::IntTest>();
  193.     intev.Add<&IntStatic::IntTest2>();
  194.     intev(20);
  195.     intev.Remove<&IntStatic::IntTest>();
  196.     intev.Remove<&IntStatic::IntTest>();
  197.     intev.Remove<Int, &Int::Test>(i);
  198.     intev(20);
  199.  
  200.     Event<std::string, std::string> doublestringev;
  201.  
  202.     doublestringev.Add<Multi, &Multi::Test>( m );
  203.     doublestringev( "Bark Bark", "Meow Meow" );
  204.     doublestringev.Remove<Multi, &Multi::Test>( m );
  205.  
  206.     doublestringev.Add<&Multi::Test2>( );
  207.     doublestringev( "Bahh Bahh", "Moo Moo" );
  208.  
  209.     return 0;
  210. }
Success #stdin #stdout 0s 3068KB
comments (?)
stdin
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Fuck yeah, Callbacks!
stdout
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20 on the inside of a class... ?
Got myself a 20 !
Now _I_ Got myself a 20 !
Now _I_ Got myself a 20 !
Dat Multi Member Function: Bark Bark | Meow Meow
Dat Static Multi Function: Bahh Bahh | Moo Moo
https://ideone.com/PTH7aQ
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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