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利用C++的模板模拟.net的代理语法
阅读量：2180 次
发布时间：2019-05-01

本文共 20030 字，大约阅读时间需要 66 分钟。

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用了一段时间.net的代理模式,觉得挺好使.且原来C++代码中存在大量需要代理的东西,由于没有近似的东西,都是靠接口实现的,看起来很别扭.遂想我是不是也能做这么一个东西.

boost的function不是很熟悉,但基本实现还是明白的.直接用boost::function的话,有点杀鸡用牛刀的感觉,因为我仅仅只要一个很小很小的代理语法而已.况且,这么多年过去了,写C++代码越来越没有激情,正好有这么个契机,给自己来点激情.

废话不多说,看代码(别看注释,没有注释,看不懂就去看boost::function去)

vfxdelegate.h

  1. #pragma once 
  2.  
  3. namespace VFX 
  4. { 
  5.     template<class _Fn> 
  6.     struct Delegate 
  7.     { 
  8.         ~Delegate() 
  9.         { 
  10.             delete _M_imp; 
  11.         } 
  12.  
  13.         Delegate(); 
  14.         Delegate(_Fn fn); 
  15.         template<class _Cty> 
  16.         Delegate(_Cty & obj); 
  17.         template<class _Cty> 
  18.         Delegate(_Cty & obj,_Fn fn); 
  19.  
  20.         Delegate & operator = (_Fn fn); 
  21.         template<class _Cty> 
  22.         Delegate & operator = (_Cty obj); 
  23.  
  24.         Delegate(const Delegate & rh); 
  25.         Delegate & operator = (const Delegate & rh); 
  26.  
  27.         bool operator == (const Delegate & rh) const; 
  28.         bool operator != (const Delegate & rh) const; 
  29.  
  30.         operator bool () const; 
  31.         void swap(Delegate & rh); 
  32.     }; 
  33.  
  34.     template<class _Ty> 
  35.     struct MultDelegate 
  36.     { 
  37.         typedef Delegate<_Ty> delegate_type; 
  38.         typedef stl::vector<delegate_type> delegate_vectory; 
  39.  
  40.         MultDelegate & operator += (const delegate_type & dt); 
  41.         MultDelegate & operator -= (const delegate_type & dt); 
  42.  
  43.         void clear(); 
  44.         void swap(MultDelegate & rh); 
  45.     private: 
  46.         delegate_vectory    m_Events; 
  47.     }; 
  48.  
  49.     namespace detail 
  50.     { 
  51.         template<class _Ty> 
  52.         struct _DelegateGetType_ 
  53.         { 
  54.             typedef _Ty type; 
  55.         }; 
  56.         template<class _Ty> 
  57.         struct _DelegateGetType_<_Ty*> 
  58.         { 
  59.             typedef _Ty type; 
  60.         }; 
  61.         template<class _Ty> 
  62.         struct _DelegateGetType_<_Ty&> 
  63.         { 
  64.             typedef _Ty type; 
  65.         }; 
  66.     } 
  67. } 
  68.  
  69. #pragma push_macro("TMPARGS") 
  70. #pragma push_macro("FUNARGS") 
  71. #pragma push_macro("FUNPARAMS") 
  72. #pragma push_macro("PARAMSLIST") 
  73.  
  74. #undef TMPARGS 
  75. #undef FUNARGS 
  76. #undef FUNPARAMS 
  77. #undef PARAMSLIST 
  78. #define TMPARGS  
  79. #define FUNARGS void 
  80. #define FUNPARAMS void 
  81. #define PARAMSLIST  
  82. #include "vfxdelegate.inl" 
  83.  
  84. #undef TMPARGS 
  85. #undef FUNARGS 
  86. #undef FUNPARAMS 
  87. #undef PARAMSLIST 
  88. #define TMPARGS ,class T0 
  89. #define FUNARGS T0 
  90. #define FUNPARAMS T0 t0 
  91. #define PARAMSLIST t0 
  92. #include "vfxdelegate.inl" 
  93.  
  94. #undef TMPARGS 
  95. #undef FUNARGS 
  96. #undef FUNPARAMS 
  97. #undef PARAMSLIST 
  98. #define TMPARGS ,class T0,class T1 
  99. #define FUNARGS T0,T1 
  100. #define FUNPARAMS T0 t0,T1 t1 
  101. #define PARAMSLIST t0,t1 
  102. #include "vfxdelegate.inl" 
  103.  
  104. #undef TMPARGS 
  105. #undef FUNARGS 
  106. #undef FUNPARAMS 
  107. #undef PARAMSLIST 
  108. #define TMPARGS ,class T0,class T1,class T2 
  109. #define FUNARGS T0,T1,T2 
  110. #define FUNPARAMS T0 t0,T1 t1,T2 t2 
  111. #define PARAMSLIST t0,t1,t2 
  112. #include "vfxdelegate.inl" 
  113.  
  114. #undef TMPARGS 
  115. #undef FUNARGS 
  116. #undef FUNPARAMS 
  117. #undef PARAMSLIST 
  118. #define TMPARGS ,class T0,class T1,class T2,class T3 
  119. #define FUNARGS T0,T1,T2,T3 
  120. #define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3 
  121. #define PARAMSLIST t0,t1,t2,t3 
  122. #include "vfxdelegate.inl" 
  123.  
  124. #undef TMPARGS 
  125. #undef FUNARGS 
  126. #undef FUNPARAMS 
  127. #undef PARAMSLIST 
  128. #define TMPARGS ,class T0,class T1,class T2,class T3,class T4 
  129. #define FUNARGS T0,T1,T2,T3,T4 
  130. #define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4 
  131. #define PARAMSLIST t0,t1,t2,t3,t4 
  132. #include "vfxdelegate.inl" 
  133.  
  134. #undef TMPARGS 
  135. #undef FUNARGS 
  136. #undef FUNPARAMS 
  137. #undef PARAMSLIST 
  138. #define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5 
  139. #define FUNARGS T0,T1,T2,T3,T4,T5 
  140. #define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5 
  141. #define PARAMSLIST t0,t1,t2,t3,t4,t5 
  142. #include "vfxdelegate.inl" 
  143.  
  144. #undef TMPARGS 
  145. #undef FUNARGS 
  146. #undef FUNPARAMS 
  147. #undef PARAMSLIST 
  148. #define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6 
  149. #define FUNARGS T0,T1,T2,T3,T4,T5,T6 
  150. #define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6 
  151. #define PARAMSLIST t0,t1,t2,t3,t4,t5,t6 
  152. #include "vfxdelegate.inl" 
  153.  
  154. #undef TMPARGS 
  155. #undef FUNARGS 
  156. #undef FUNPARAMS 
  157. #undef PARAMSLIST 
  158. #define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6,class T7 
  159. #define FUNARGS T0,T1,T2,T3,T4,T5,T6,T7 
  160. #define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6,T7 t7 
  161. #define PARAMSLIST t0,t1,t2,t3,t4,t5,t6,t7 
  162. #include "vfxdelegate.inl" 
  163.  
  164. #undef TMPARGS 
  165. #undef FUNARGS 
  166. #undef FUNPARAMS 
  167. #undef PARAMSLIST 
  168. #define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8 
  169. #define FUNARGS T0,T1,T2,T3,T4,T5,T6,T7,T8 
  170. #define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6,T7 t7,T8 t8 
  171. #define PARAMSLIST t0,t1,t2,t3,t4,t5,t6,t7,t8 
  172. #include "vfxdelegate.inl" 
  173.  
  174. #undef TMPARGS 
  175. #undef FUNARGS 
  176. #undef FUNPARAMS 
  177. #undef PARAMSLIST 
  178. #define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9 
  179. #define FUNARGS T0,T1,T2,T3,T4,T5,T6,T7,T8,T9 
  180. #define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6,T7 t7,T8 t8,T9 t9 
  181. #define PARAMSLIST t0,t1,t2,t3,t4,t5,t6,t7,t8,t9 
  182. #include "vfxdelegate.inl" 
  183.  
  184. #undef TMPARGS 
  185. #undef FUNARGS 
  186. #undef FUNPARAMS 
  187. #undef PARAMSLIST 
  188. #define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9,class T10 
  189. #define FUNARGS T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10 
  190. #define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6,T7 t7,T8 t8,T9 t9,T10 t10 
  191. #define PARAMSLIST t0,t1,t2,t3,t4,t5,t6,t7,t8,t9,t10 
  192. #include "vfxdelegate.inl" 
  193.  
  194. #undef TMPARGS 
  195. #undef FUNARGS 
  196. #undef FUNPARAMS 
  197. #undef PARAMSLIST 
  198. #define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9,class T10,class T11 
  199. #define FUNARGS T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11 
  200. #define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6,T7 t7,T8 t8,T9 t9,T10 t10,T11 t11 
  201. #define PARAMSLIST t0,t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11 
  202. #include "vfxdelegate.inl" 
  203.  
  204. #pragma pop_macro("TMPARGS") 
  205. #pragma pop_macro("FUNARGS") 
  206. #pragma pop_macro("FUNPARAMS") 
  207. #pragma pop_macro("PARAMSLIST") 

vfxdelegate.inl

  1. namespace VFX 
  2. { 
  3.     template<class _Result TMPARGS> 
  4.     struct Delegate<_Result(FUNARGS)> 
  5.     { 
  6.     private: 
  7.         struct Impl 
  8.         { 
  9.             virtual ~Impl(){} 
  10.             virtual _Result Call(FUNPARAMS) = 0; 
  11.             virtual Impl * Clone() const = 0; 
  12.             virtual char Type() const = 0; 
  13.             virtual bool Equip(const Impl * rh) const = 0; 
  14.         }; 
  15.         struct FnImpl : Impl 
  16.         { 
  17.             typedef _Result(*fun_type)(FUNARGS); 
  18.             fun_type _M_fn; 
  19.             FnImpl(fun_type fn):_M_fn(fn){} 
  20.             virtual _Result Call(FUNPARAMS) 
  21.             { 
  22.                 return _M_fn(PARAMSLIST); 
  23.             } 
  24.             virtual Impl * Clone() const 
  25.             { 
  26.                 return new FnImpl(_M_fn); 
  27.             } 
  28.             virtual char Type() const 
  29.             { 
  30.                 return 1; 
  31.             } 
  32.             virtual bool Equip(const Impl * rh) const 
  33.             { 
  34.                 return _M_fn == ((FnImpl *)rh)->_M_fn; 
  35.             } 
  36.         }; 
  37.         template<class _Cty> 
  38.         struct MemfnImpl : Impl 
  39.         { 
  40.             typedef _Result(_Cty::*fun_type)(FUNARGS); 
  41.             fun_type _M_fn; 
  42.             _Cty * _M_obj; 
  43.             MemfnImpl(_Cty * obj,fun_type fn):_M_fn(fn),_M_obj(obj){} 
  44.             MemfnImpl(_Cty & obj,fun_type fn):_M_fn(fn),_M_obj(&obj){} 
  45.             virtual _Result Call(FUNPARAMS) 
  46.             { 
  47.                 return (_M_obj->*_M_fn)(PARAMSLIST); 
  48.             } 
  49.             virtual Impl * Clone() const 
  50.             { 
  51.                 return new MemfnImpl(_M_obj,_M_fn); 
  52.             } 
  53.             virtual char Type() const 
  54.             { 
  55.                 return 2; 
  56.             } 
  57.             virtual bool Equip(const Impl * rh) const 
  58.             { 
  59.                 return _M_fn == ((MemfnImpl *)rh)->_M_fn && _M_obj == ((MemfnImpl *)rh)->_M_obj; 
  60.             } 
  61.         }; 
  62.         template<class _Cty> 
  63.         struct ObjfnImpl : Impl 
  64.         { 
  65.             _Cty * _M_obj; 
  66.             ObjfnImpl(_Cty * obj):_M_obj(obj){} 
  67.             ObjfnImpl(_Cty & obj):_M_obj(&obj){} 
  68.             virtual _Result Call(FUNPARAMS) 
  69.             { 
  70.                 return _M_obj->operator()(PARAMSLIST); 
  71.             } 
  72.             virtual Impl * Clone() const 
  73.             { 
  74.                 return new ObjfnImpl(_M_obj); 
  75.             } 
  76.             virtual char Type() const 
  77.             { 
  78.                 return 3; 
  79.             } 
  80.             virtual bool Equip(const Impl * rh) const 
  81.             { 
  82.                 return _M_obj == ((MemfnImpl *)rh)->_M_obj; 
  83.             } 
  84.         }; 
  85.  
  86.         Impl * _M_imp; 
  87.  
  88.     public: 
  89.         ~Delegate() 
  90.         { 
  91.             delete _M_imp; 
  92.         } 
  93.  
  94.         Delegate():_M_imp(0){} 
  95.         Delegate(_Result(*fn)(FUNARGS)) 
  96.             :_M_imp(new FnImpl(fn)){} 
  97.  
  98.         template<class _Cty> 
  99.         Delegate(_Cty & obj) 
  100.             :_M_imp(new ObjfnImpl<VFX::detail::_DelegateGetType_<_Cty>::type>(obj)){} 
  101.  
  102.         template<class _Cty> 
  103.         Delegate(_Cty & obj,_Result(_Cty::*fn)(FUNARGS)) 
  104.             :_M_imp(new MemfnImpl<VFX::detail::_DelegateGetType_<_Cty>::type>(obj,fn)){} 
  105.  
  106.         Delegate & operator = (_Result(*fn)(FUNARGS)) 
  107.         { 
  108.             delete _M_imp; 
  109.             _M_imp = new FnImpl; 
  110.         } 
  111.         template<class _Cty> 
  112.         Delegate & operator = (_Cty obj) 
  113.         { 
  114.             delete _M_imp; 
  115.             _M_imp = new ObjfnImpl<VFX::detail::_DelegateGetType_<_Cty>::type>(obj); 
  116.         } 
  117.  
  118.         Delegate(const Delegate & rh) 
  119.         { 
  120.             if(rh._M_imp != 0) 
  121.                 _M_imp = rh._M_imp->Clone(); 
  122.             else 
  123.                 _M_imp = 0; 
  124.         } 
  125.         Delegate & operator = (const Delegate & rh) 
  126.         { 
  127.             if(this != &rh) 
  128.             { 
  129.                 delete _M_imp; 
  130.                 if(rh._M_imp != 0) 
  131.                     _M_imp = rh._M_imp->Clone(); 
  132.                 else 
  133.                     _M_imp = 0; 
  134.             } 
  135.             return *this; 
  136.         } 
  137.  
  138.         bool operator == (const Delegate & rh) const 
  139.         { 
  140.             if(_M_imp == NULL || rh._M_imp == NULL) 
  141.                 return _M_imp == rh._M_imp; 
  142.             return _M_imp->Type() == rh._M_imp->Type() && 
  143.                 _M_imp->Equip(rh._M_imp); 
  144.         } 
  145.  
  146.         bool operator != (const Delegate & rh) const 
  147.         { 
  148.             return !(operator ==(rh)); 
  149.         } 
  150.  
  151.         _Result operator()(FUNPARAMS) const 
  152.         { 
  153.             if(_M_imp == NULL) 
  154.                 throw std::runtime_error("call null delegate"); 
  155.             return _M_imp->Call(PARAMSLIST); 
  156.         } 
  157.  
  158.         operator bool () const 
  159.         { 
  160.             return _M_imp != 0; 
  161.         } 
  162.  
  163.         void swap(Delegate & rh) 
  164.         { 
  165.             Impl * temp = _M_imp; 
  166.             _M_imp = rh._M_imp; 
  167.             rh._M_imp = temp; 
  168.         } 
  169.     }; 
  170.  
  171.     template<class _Result TMPARGS> 
  172.     struct MultDelegate<_Result(FUNARGS)> 
  173.     { 
  174.         typedef Delegate<_Result(FUNARGS)> delegate_type; 
  175.         typedef stl::vector<delegate_type> delegate_vectory; 
  176.  
  177.         void clear() 
  178.         { 
  179.             m_Events.clear(); 
  180.         } 
  181.         MultDelegate & operator += (const delegate_type & dt) 
  182.         { 
  183.             for(delegate_vectory::iterator i=m_Events.begin(); i!=m_Events.end(); ++i) 
  184.             { 
  185.                 if(*i == dt) 
  186.                     return *this; 
  187.             } 
  188.             m_Events.push_back(dt); 
  189.             return *this; 
  190.         } 
  191.         MultDelegate & operator -= (const delegate_type & dt) 
  192.         { 
  193.             for(delegate_vectory::iterator i=m_Events.begin(); i!=m_Events.end(); ++i) 
  194.             { 
  195.                 if(*i == dt) 
  196.                 { 
  197.                     m_Events.erase(i); 
  198.                     break; 
  199.                 } 
  200.             } 
  201.             return *this; 
  202.         } 
  203.         void operator()(FUNPARAMS) const 
  204.         { 
  205.             for(delegate_vectory::const_iterator i=m_Events.begin(); i!=m_Events.end(); ++i) 
  206.             { 
  207.                 if(*i) (*i)(PARAMSLIST); 
  208.             } 
  209.         } 
  210.  
  211.         void swap(MultDelegate & rh) 
  212.         { 
  213.             m_Events.swap(rh.m_Events); 
  214.         } 
  215.     private: 
  216.         delegate_vectory    m_Events; 
  217.     }; 
  218. } 

使用案例:

  1. typedef VFX::Delegate<void(VIPropertyEditAble *)> PropertyGridEvents; 
  2.  
  3. class PGRID_API CPropertyGridEditor : public CXTPPropertyGrid 
  4. { 
  5.     DECLARE_DYNAMIC(CPropertyGridEditor) 
  6.     VIPropertyEditAble *        m_pObject; 
  7.  
  8.     VFX::MultDelegate<void(VIPropertyEditAble *)> ValueChanged; 
  9.     void NotifyListener_ValueChanged() 
  10.     { 
  11.         this->ValueChanged(m_pObject); 
  12.     } 
  13. }; 
  14.  
  15. class CMapEditorDoc : public CDocument 
  16. { 
  17.     void OnGridValueChanged(VIPropertyEditAble * pObject); 
  18.     { 
  19.         if(pObject != NULL) 
  20.             SetModifiedFlag(TRUE); 
  21.     } 
  22. }; 
  23.  
  24. //CPropertyGridEditor   m_wndPropertyGrid; 
  25. void CMainFrame::InitDocument() 
  26. { 
  27.     CMapEditorDoc * pDoc = (CMapEditorDoc *)GetActiveDocument(); 
  28.     m_wndPropertyGrid.ValueChanged += PropertyGridEvents(*pDoc,&CMapEditorDoc::OnGridValueChanged); 
  29. } 

注：stl::vector<>是std::vector<,VFX::alloctor>的typedef。因此，你只需要把stl替换成std就可以了

 

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