利用C++的模板模拟.net的代理语法

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

#pragma oncenamespace VFX{template<class _Fn>struct Delegate{~Delegate(){delete _M_imp;}Delegate();Delegate(_Fn fn);template<class _Cty>Delegate(_Cty & obj);template<class _Cty>Delegate(_Cty & obj,_Fn fn);Delegate & operator = (_Fn fn);template<class _Cty>Delegate & operator = (_Cty obj);Delegate(const Delegate & rh);Delegate & operator = (const Delegate & rh);bool operator == (const Delegate & rh) const;bool operator != (const Delegate & rh) const;operator bool () const;void swap(Delegate & rh);};template<class _Ty>struct MultDelegate{typedef Delegate<_Ty> delegate_type;typedef stl::vector<delegate_type> delegate_vectory;MultDelegate & operator += (const delegate_type & dt);MultDelegate & operator -= (const delegate_type & dt);void clear();void swap(MultDelegate & rh);private:delegate_vectorym_Events;};namespace detail{template<class _Ty>struct _DelegateGetType_{typedef _Ty type;};template<class _Ty>struct _DelegateGetType_<_Ty*>{typedef _Ty type;};template<class _Ty>struct _DelegateGetType_<_Ty&>{typedef _Ty type;};}}#pragma push_macro("TMPARGS")#pragma push_macro("FUNARGS")#pragma push_macro("FUNPARAMS")#pragma push_macro("PARAMSLIST")#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS #define FUNARGS void#define FUNPARAMS void#define PARAMSLIST #include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0#define FUNARGS T0#define FUNPARAMS T0 t0#define PARAMSLIST t0#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0,class T1#define FUNARGS T0,T1#define FUNPARAMS T0 t0,T1 t1#define PARAMSLIST t0,t1#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0,class T1,class T2#define FUNARGS T0,T1,T2#define FUNPARAMS T0 t0,T1 t1,T2 t2#define PARAMSLIST t0,t1,t2#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0,class T1,class T2,class T3#define FUNARGS T0,T1,T2,T3#define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3#define PARAMSLIST t0,t1,t2,t3#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0,class T1,class T2,class T3,class T4#define FUNARGS T0,T1,T2,T3,T4#define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4#define PARAMSLIST t0,t1,t2,t3,t4#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5#define FUNARGS T0,T1,T2,T3,T4,T5#define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5#define PARAMSLIST t0,t1,t2,t3,t4,t5#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6#define FUNARGS T0,T1,T2,T3,T4,T5,T6#define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6#define PARAMSLIST t0,t1,t2,t3,t4,t5,t6#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6,class T7#define FUNARGS T0,T1,T2,T3,T4,T5,T6,T7#define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6,T7 t7#define PARAMSLIST t0,t1,t2,t3,t4,t5,t6,t7#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8#define FUNARGS T0,T1,T2,T3,T4,T5,T6,T7,T8#define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6,T7 t7,T8 t8#define PARAMSLIST t0,t1,t2,t3,t4,t5,t6,t7,t8#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9#define FUNARGS T0,T1,T2,T3,T4,T5,T6,T7,T8,T9#define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6,T7 t7,T8 t8,T9 t9#define PARAMSLIST t0,t1,t2,t3,t4,t5,t6,t7,t8,t9#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#define TMPARGS ,class T0,class T1,class T2,class T3,class T4,class T5,class T6,class T7,class T8,class T9,class T10#define FUNARGS T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10#define FUNPARAMS T0 t0,T1 t1,T2 t2,T3 t3,T4 t4,T5 t5,T6 t6,T7 t7,T8 t8,T9 t9,T10 t10#define PARAMSLIST t0,t1,t2,t3,t4,t5,t6,t7,t8,t9,t10#include "vfxdelegate.inl"#undef TMPARGS#undef FUNARGS#undef FUNPARAMS#undef PARAMSLIST#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#define FUNARGS T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11#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#define PARAMSLIST t0,t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11#include "vfxdelegate.inl"#pragma pop_macro("TMPARGS")#pragma pop_macro("FUNARGS")#pragma pop_macro("FUNPARAMS")#pragma pop_macro("PARAMSLIST")

 

vfxdelegate.inl

namespace VFX{template<class _Result TMPARGS>struct Delegate<_Result(FUNARGS)>{private:struct Impl{virtual ~Impl(){}virtual _Result Call(FUNPARAMS) = 0;virtual Impl * Clone() const = 0;virtual char Type() const = 0;virtual bool Equip(const Impl * rh) const = 0;};struct FnImpl : Impl{typedef _Result(*fun_type)(FUNARGS);fun_type _M_fn;FnImpl(fun_type fn):_M_fn(fn){}virtual _Result Call(FUNPARAMS){return _M_fn(PARAMSLIST);}virtual Impl * Clone() const{return new FnImpl(_M_fn);}virtual char Type() const{return 1;}virtual bool Equip(const Impl * rh) const{return _M_fn == ((FnImpl *)rh)->_M_fn;}};template<class _Cty>struct MemfnImpl : Impl{typedef _Result(_Cty::*fun_type)(FUNARGS);fun_type _M_fn;_Cty * _M_obj;MemfnImpl(_Cty * obj,fun_type fn):_M_fn(fn),_M_obj(obj){}MemfnImpl(_Cty & obj,fun_type fn):_M_fn(fn),_M_obj(&obj){}virtual _Result Call(FUNPARAMS){return (_M_obj->*_M_fn)(PARAMSLIST);}virtual Impl * Clone() const{return new MemfnImpl(_M_obj,_M_fn);}virtual char Type() const{return 2;}virtual bool Equip(const Impl * rh) const{return _M_fn == ((MemfnImpl *)rh)->_M_fn && _M_obj == ((MemfnImpl *)rh)->_M_obj;}};template<class _Cty>struct ObjfnImpl : Impl{_Cty * _M_obj;ObjfnImpl(_Cty * obj):_M_obj(obj){}ObjfnImpl(_Cty & obj):_M_obj(&obj){}virtual _Result Call(FUNPARAMS){return _M_obj->operator()(PARAMSLIST);}virtual Impl * Clone() const{return new ObjfnImpl(_M_obj);}virtual char Type() const{return 3;}virtual bool Equip(const Impl * rh) const{return _M_obj == ((MemfnImpl *)rh)->_M_obj;}};Impl * _M_imp;public:~Delegate(){delete _M_imp;}Delegate():_M_imp(0){}Delegate(_Result(*fn)(FUNARGS)):_M_imp(new FnImpl(fn)){}template<class _Cty>Delegate(_Cty & obj):_M_imp(new ObjfnImpl<VFX::detail::_DelegateGetType_<_Cty>::type>(obj)){}template<class _Cty>Delegate(_Cty & obj,_Result(_Cty::*fn)(FUNARGS)):_M_imp(new MemfnImpl<VFX::detail::_DelegateGetType_<_Cty>::type>(obj,fn)){}Delegate & operator = (_Result(*fn)(FUNARGS)){delete _M_imp;_M_imp = new FnImpl;}template<class _Cty>Delegate & operator = (_Cty obj){delete _M_imp;_M_imp = new ObjfnImpl<VFX::detail::_DelegateGetType_<_Cty>::type>(obj);}Delegate(const Delegate & rh){if(rh._M_imp != 0)_M_imp = rh._M_imp->Clone();else_M_imp = 0;}Delegate & operator = (const Delegate & rh){if(this != &rh){delete _M_imp;if(rh._M_imp != 0)_M_imp = rh._M_imp->Clone();else_M_imp = 0;}return *this;}bool operator == (const Delegate & rh) const{if(_M_imp == NULL || rh._M_imp == NULL)return _M_imp == rh._M_imp;return _M_imp->Type() == rh._M_imp->Type() &&_M_imp->Equip(rh._M_imp);}bool operator != (const Delegate & rh) const{return !(operator ==(rh));}_Result operator()(FUNPARAMS) const{if(_M_imp == NULL)throw std::runtime_error("call null delegate");return _M_imp->Call(PARAMSLIST);}operator bool () const{return _M_imp != 0;}void swap(Delegate & rh){Impl * temp = _M_imp;_M_imp = rh._M_imp;rh._M_imp = temp;}};template<class _Result TMPARGS>struct MultDelegate<_Result(FUNARGS)>{typedef Delegate<_Result(FUNARGS)> delegate_type;typedef stl::vector<delegate_type> delegate_vectory;void clear(){m_Events.clear();}MultDelegate & operator += (const delegate_type & dt){for(delegate_vectory::iterator i=m_Events.begin(); i!=m_Events.end(); ++i){if(*i == dt)return *this;}m_Events.push_back(dt);return *this;}MultDelegate & operator -= (const delegate_type & dt){for(delegate_vectory::iterator i=m_Events.begin(); i!=m_Events.end(); ++i){if(*i == dt){m_Events.erase(i);break;}}return *this;}void operator()(FUNPARAMS) const{for(delegate_vectory::const_iterator i=m_Events.begin(); i!=m_Events.end(); ++i){if(*i) (*i)(PARAMSLIST);}}void swap(MultDelegate & rh){m_Events.swap(rh.m_Events);}private:delegate_vectorym_Events;};}

 

使用案例:

typedef VFX::Delegate<void(VIPropertyEditAble *)> PropertyGridEvents;class PGRID_API CPropertyGridEditor : public CXTPPropertyGrid{DECLARE_DYNAMIC(CPropertyGridEditor)VIPropertyEditAble *m_pObject;VFX::MultDelegate<void(VIPropertyEditAble *)> ValueChanged;void NotifyListener_ValueChanged(){this->ValueChanged(m_pObject);}};class CMapEditorDoc : public CDocument{void OnGridValueChanged(VIPropertyEditAble * pObject);{if(pObject != NULL)SetModifiedFlag(TRUE);}};//CPropertyGridEditorm_wndPropertyGrid;void CMainFrame::InitDocument(){CMapEditorDoc * pDoc = (CMapEditorDoc *)GetActiveDocument();m_wndPropertyGrid.ValueChanged += PropertyGridEvents(*pDoc,&CMapEditorDoc::OnGridValueChanged);}

 

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