C++事件的实现
C++
事件的实现
2005-12-30 baickl
于
Beijin
简介
本文将向你演示如何在标准
C++
中实现
C++Builder
中的
__closure
，以及
C#
中的
__delegate
机制，所以在看本文之前，请确定自己对这些机制已经有所了解。通过本文你将可以领略
C++
语言的无限魅力以及他的深奥。
(
注：非经授权，请勿请将此文用于商业活动）
原理探讨
在探讨之前，先看一下
C#
里的
__delegate
的用法，请看下例：
Delegate int SomeDelegate(string s, bool b); //
委托申明
rivate int SomeFunction(string str, bool bln){...} //某个类中的成员函数
SomeDelegate sd = new SomeDelegate(SomeFunction); //创建一个委托
sd(str,false); //由委托调用函数
上面部分为伪代码，相信接触过事件机构的人，都应该明白他的意思。由上面这段代码我们总结一下
C#
里委托的一些基本原理：
1.C#
中的委托是一个类，当你声明他的时候，就产生一个新的类型
2.C#
中的委托类创建的实例，可以通过函数的地址来初始化
3.C#
中的委托调用，实际上只是简单的调用被委托的函数
OK,
我们只需要了解这么多信息，如果有不对的地方，还请各位纠正。下面我们分析一下
C++
中的事件的实现的困难度及原理。在
C++
中我们实现的事件必须具备以下特性：
1.
事件所委托的函数的多样参数支持
2.
支持类成员函数及类外部函数的委托
3.可以实现调用事件来达到调用委托函数的目的
上面的叙述，可能不是非常清楚，好吧，我就以具体的代码来说明这一切。我相信大部分技术人员还是不反感看代码的。在此做个声明，在C++中实现事件机构，绝对要用模板类来实现，除非你做的像Java里的事件机制，那我无话可说。
我们首先讨论第一个问题，这个问题是最难以被解决的。至少本人目前在网上所见到的事件机构，都只能支持一种参数。要么只有2个参数，要么只有3个参数，那我对这一块也做一些相关的讨论，以说明我的实现的原理。
其实在C++中，大家应该听过模板默认类型吧（听到这，某些人应该知道我所说的原理了），对，我就是用他来做对多参数的支持。看下面的声明：
struct null_event{};//声明一个空类型，以作默认参数使用
template
<
typename RT, //返回值，以下是参数列表，注意，全部采用了默认参数
typename T0 = null_event, typename T1 = null_event, typename T2 = null_event,
typename T3 = null_event, typename T4 = null_event, typename T5 = null_event,
typename T6 = null_event, typename T7 = null_event, typename T8 = null_event,
typename T9 = null_event, typename T10 = null_event, typename T11 = null_event
typename RT, //返回值，以下是参数列表，注意，全部采用了默认参数
typename T0 = null_event, typename T1 = null_event, typename T2 = null_event,
typename T3 = null_event, typename T4 = null_event, typename T5 = null_event,
typename T6 = null_event, typename T7 = null_event, typename T8 = null_event,
typename T9 = null_event, typename T10 = null_event, typename T11 = null_event
>
class BaseEvent
{
public:
virtual~BaseEvent(){}
//以下为调用形式，我给出了13种调用形式，分别对应13种情况
virtual RT Invoke()=0;
virtual RT Invoke(T0)=0;
virtual RT Invoke(T0,T1)=0;
virtual RT Invoke(T0,T1,T2)=0;
virtual RT Invoke(T0,T1,T2,T3)=0;
virtual RT Invoke(T0,T1,T2,T3,T4)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6,T7)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6,T7,T8)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6,T7,T9,T9)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11)=0;
};
我们的事件基类虽然被创建出来了，但我们需要做的还很多，我们需要解决怎么将类成员函数和类外部函数同事件类相挂接。这一部分需要通过派生类来实现。首先我们看看类外部函数事件的实现：
template
<
typename RT,//下面的形式是不是很熟悉？
typename T0 = null_event, typename T1 = null_event, typename T2 = null_event,
typename T3 = null_event, typename T4 = null_event, typename T5 = null_event,
typename T6 = null_event, typename T7 = null_event, typename T8 = null_event,
typename T9 = null_event,typename T10 = null_event,typename T11 = null_event
>
<
typename RT,//下面的形式是不是很熟悉？
typename T0 = null_event, typename T1 = null_event, typename T2 = null_event,
typename T3 = null_event, typename T4 = null_event, typename T5 = null_event,
typename T6 = null_event, typename T7 = null_event, typename T8 = null_event,
typename T9 = null_event,typename T10 = null_event,typename T11 = null_event
>
class NormalEvent:public BaseEvent
{
private:
{
private:
//定义不同类型的函数，参数支持范围为0-12个
typedef RT (*FUN0) ();
typedef RT (*FUN1) (T0);
typedef RT (*FUN2) (T0,T1);
typedef RT (*FUN3) (T0,T1,T2);
typedef RT (*FUN4) (T0,T1,T2,T3);
typedef RT (*FUN5) (T0,T1,T2,T3,T4);
typedef RT (*FUN6) (T0,T1,T2,T3,T4,T5);
typedef RT (*FUN7) (T0,T1,T2,T3,T4,T5,T6);
typedef RT (*FUN8) (T0,T1,T2,T3,T4,T5,T6,T7);
typedef RT (*FUN9) (T0,T1,T2,T3,T4,T5,T6,T7,T8);
typedef RT (*FUN10)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9);
typedef RT (*FUN11)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10);
typedef RT (*FUN12)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11);
private:
//创建函数的指针
FUN0 m_Fun0;
FUN1 m_Fun1;
FUN2 m_Fun2;
FUN3 m_Fun3;
FUN4 m_Fun4;
FUN5 m_Fun5;
FUN6 m_Fun6;
FUN7 m_Fun7;
FUN8 m_Fun8;
FUN9 m_Fun9;
FUN10 m_Fun10;
FUN11 m_Fun11;
FUN12 m_Fun12;
//默认初始化工作
void Default()
{
m_Fun0=0;
m_Fun1=0;
m_Fun2=0;
m_Fun3=0;
m_Fun4=0;
m_Fun5=0;
m_Fun6=0;
m_Fun7=0;
m_Fun8=0;
m_Fun9=0;
m_Fun10=0;
m_Fun11=0;
m_Fun12=0;
}
public:
//其实关键都在这些构造函数里，因为构造函数有13种，
//所以支持13种类型的外部函数被挂接到事件对象中
NormalEvent(FUN0 Fun)
{
assert(Fun!=0);
Default();
m_Fun0=Fun;
}
NormalEvent(FUN1 Fun)
{
assert(Fun!=0);
Default();
m_Fun1=Fun;
}
NormalEvent(FUN2 Fun)
{
assert(Fun!=0);
Default();
m_Fun2=Fun;
}
NormalEvent(FUN3 Fun)
{
assert(Fun!=0);
Default();
m_Fun3=Fun;
}
//被省略的部分。。。
NormalEvent(FUN12 Fun)
{
assert(Fun!=0);
Default();
m_Fun12=Fun;
}
//以下是不同形式的调用，取决于你的函数参数，不多做说明
virtual RT Invoke()//挂接无参函数的委托调用
{
assert(m_Fun0!=0);
return (*m_Fun0)();
}
virtual RT Invoke(T0 _0)//挂接一个参数函数的委托调用
{
assert(m_Fun1!=0);
return(*m_Fun1)(_0);
}
virtual RT Invoke(T0 _0 , T1 _1)//挂接两个参数函数的委托调用
{
assert(m_Fun2!=0);
return(*m_Fun2)(_0,_1);
}
.
.
省略一部分。。其实大家都知道
.
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10 , T11 _11)
{
assert(m_Fun12!=0);
return(*m_Fun12)(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11);
}
};
到上面这一部分，应该比较明了了。因为原理已经很清楚，是不是有点像boost里的tuple实现机制，没错，就是他。对于类外部函数的调用就已经非常明了，我们还需要给几一些函数来做最基本的挂接工作，如下，先不说明为什么这么说，看到后面大家就会明白了。
template
BaseEvent
BaseEvent
{
return new NormalEvent
return new NormalEvent
template
BaseEvent*EventHandler(RT (*fun)(T0))
{
return new NormalEvent(fun);
return new NormalEvent
}
template
BaseEvent*EventHandler(RT (*fun)(T0,T1))
{
return new NormalEvent(fun);
}
//以下省略..
上面是对类外部事件的完成，那么对类成员函数事件的原理也是一样的，我们仅贴出相关的代码不多做说明，在最后的时候，会介绍一个整合的类，用以完成对事件的更完整的描述及封装。
template
<
typename C,
typename RT,
typename T0 = null_event,typename T1 = null_event,typename T2 = null_event,typename T3 = null_event,
typename T4 = null_event,typename T5 = null_event,typename T6 = null_event,typename T7 = null_event,
typename T8 = null_event,typename T9 = null_event,typename T10 = null_event,typename T11 = null_event
>
class MemberEvent:public BaseEvent
{
private:
typedef RT (C::*FUN0) ();
typedef RT (C::*FUN1) (T0);
typedef RT (C::*FUN2) (T0,T1);
typedef RT (C::*FUN3) (T0,T1,T2);
typedef RT (C::*FUN4) (T0,T1,T2,T3);
typedef RT (C::*FUN5) (T0,T1,T2,T3,T4);
typedef RT (C::*FUN6) (T0,T1,T2,T3,T4,T5);
typedef RT (C::*FUN7) (T0,T1,T2,T3,T4,T5,T6);
typedef RT (C::*FUN8) (T0,T1,T2,T3,T4,T5,T6,T7);
typedef RT (C::*FUN9) (T0,T1,T2,T3,T4,T5,T6,T7,T8);
typedef RT (C::*FUN10)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9);
typedef RT (C::*FUN11)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10);
typedef RT (C::*FUN12)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11);
private:
FUN0 m_Fun0;
FUN1 m_Fun1;
FUN2 m_Fun2;
FUN3 m_Fun3;
FUN4 m_Fun4;
FUN5 m_Fun5;
FUN6 m_Fun6;
FUN7 m_Fun7;
FUN8 m_Fun8;
FUN9 m_Fun9;
FUN10 m_Fun10;
FUN11 m_Fun11;
FUN12 m_Fun12;
C *m_Object;
void Default()
{
m_Fun0=0;
m_Fun1=0;
m_Fun2=0;
m_Fun3=0;
m_Fun4=0;
m_Fun5=0;
m_Fun6=0;
m_Fun7=0;
m_Fun8=0;
m_Fun9=0;
m_Fun10=0;
m_Fun11=0;
m_Fun12=0;
m_Object=0;
}
public:
MemberEvent(C*pObject,FUN0 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun0=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN1 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun1=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN2 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun2=Fun;
m_Object=pObject;
}
//中间省略。。。
MemberEvent(C*pObject,FUN12 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun12=Fun;
m_Object=pObject;
}
virtual RT Invoke()
{
assert(m_Object!=0);
assert(m_Fun0!=0);
return (m_Object->*m_Fun0)();
}
virtual RT Invoke(T0 _0)
{
assert(m_Object!=0);
assert(m_Fun1!=0);
return(m_Object->*m_Fun1)(_0);
}
virtual RT Invoke(T0 _0 , T1 _1)
{
assert(m_Object!=0);
assert(m_Fun2!=0);
return(m_Object->*m_Fun2)(_0,_1);
}
//中间省略
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10 , T11 _11)
{
assert(m_Object!=0);
assert(m_Fun12!=0);
return(m_Object->*m_Fun12)(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11);
}
};
template
<
typename C,typename RT
>
BaseEvent
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2))
{
return new MemberEvent(obj,fun);
}
//以下部分省略
以下为最终封装类的代码不做多说，大家一会看到示例就会明白了。：
template
<
typename RT,
typename T0 = null_event,typename T1 = null_event,typename T2 = null_event,typename T3 = null_event,
typename T4 = null_event,typename T5 = null_event,typename T6 = null_event,typename T7 = null_event,
typename T8 = null_event,typename T9 = null_event,typename T10 = null_event,typename T11 = null_event
>
class __Event
{
typedef BaseEvent*eventHandler;
private:
eventHandler m_EventHandler;
public:
bool IsValid()const
{
if(m_EventHandler!=0)
return true;
else
return false;
}
public:
__Event()
{
m_EventHandler=0;
}
virtual~__Event()
{
if(m_EventHandler!=0)
{
delete m_EventHandler;
m_EventHandler=0;
}
}
void operator=(BaseEvent*event)
{
if(m_EventHandler!=0)
{
delete m_EventHandler;
m_EventHandler=0;
}
m_EventHandler=event;
}
RT Invoke()
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke();
}
RT Invoke(T0 _0)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0);
}
RT Invoke(T0 _0 , T1 _1)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1);
}
RT Invoke(T0 _0 , T1 _1 , T2 _2)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2);
}
//省略相关代码
RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10 , T11 _11)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3 ,_4,_5,_6,_7,_8,_9,_10,_11);
}
RT operator()()
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke();
}
RT operator()(T0 _0)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0);
}
RT operator()(T0 _0 , T1 _1)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1);
}
RT operator()(T0 _0 , T1 _1 , T2 _2)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2);
}
//省略相关代码
RT operator()(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10 , T11 _11)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3 ,_4,_5,_6,_7,_8,_9,_10,_11);
}
};
以上就是具体的实现过程，具体的全部源代码在下面一栏，具体实现里给出
具体实现
#ifndef EVENT_INCLUDE
#define EVENT_INCLUDE
#include
#pragma warning(disable:4251)
namespace KtyGE
{
struct null_event{};
template
<
typename RT,
typename T0 = null_event,typename T1 = null_event,typename T2 = null_event,typename T3 = null_event,
typename T4 = null_event,typename T5 = null_event,typename T6 = null_event,typename T7 = null_event,
typename T8 = null_event,typename T9 = null_event,typename T10 = null_event,typename T11 = null_event
>
class BaseEvent
{
public:
virtual~BaseEvent(){}
virtual RT Invoke()=0;
virtual RT Invoke(T0)=0;
virtual RT Invoke(T0,T1)=0;
virtual RT Invoke(T0,T1,T2)=0;
virtual RT Invoke(T0,T1,T2,T3)=0;
virtual RT Invoke(T0,T1,T2,T3,T4)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6,T7)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6,T7,T8)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6,T7,T9,T9)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10)=0;
virtual RT Invoke(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11)=0;
};
template
<
typename RT,
typename T0 = null_event,typename T1 = null_event,typename T2 = null_event,typename T3 = null_event,
typename T4 = null_event,typename T5 = null_event,typename T6 = null_event,typename T7 = null_event,
typename T8 = null_event,typename T9 = null_event,typename T10 = null_event,typename T11 = null_event
>
class NormalEvent:public BaseEvent
{
private:
typedef RT (*FUN0) ();
typedef RT (*FUN1) (T0);
typedef RT (*FUN2) (T0,T1);
typedef RT (*FUN3) (T0,T1,T2);
typedef RT (*FUN4) (T0,T1,T2,T3);
typedef RT (*FUN5) (T0,T1,T2,T3,T4);
typedef RT (*FUN6) (T0,T1,T2,T3,T4,T5);
typedef RT (*FUN7) (T0,T1,T2,T3,T4,T5,T6);
typedef RT (*FUN8) (T0,T1,T2,T3,T4,T5,T6,T7);
typedef RT (*FUN9) (T0,T1,T2,T3,T4,T5,T6,T7,T8);
typedef RT (*FUN10)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9);
typedef RT (*FUN11)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10);
typedef RT (*FUN12)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11);
private:
FUN0 m_Fun0;
FUN1 m_Fun1;
FUN2 m_Fun2;
FUN3 m_Fun3;
FUN4 m_Fun4;
FUN5 m_Fun5;
FUN6 m_Fun6;
FUN7 m_Fun7;
FUN8 m_Fun8;
FUN9 m_Fun9;
FUN10 m_Fun10;
FUN11 m_Fun11;
FUN12 m_Fun12;
void Default()
{
m_Fun0=0;
m_Fun1=0;
m_Fun2=0;
m_Fun3=0;
m_Fun4=0;
m_Fun5=0;
m_Fun6=0;
m_Fun7=0;
m_Fun8=0;
m_Fun9=0;
m_Fun10=0;
m_Fun11=0;
m_Fun12=0;
}
public:
NormalEvent(FUN0 Fun)
{
assert(Fun!=0);
Default();
m_Fun0=Fun;
}
NormalEvent(FUN1 Fun)
{
assert(Fun!=0);
Default();
m_Fun1=Fun;
}
NormalEvent(FUN2 Fun)
{
assert(Fun!=0);
Default();
m_Fun2=Fun;
}
NormalEvent(FUN3 Fun)
{
assert(Fun!=0);
Default();
m_Fun3=Fun;
}
NormalEvent(FUN4 Fun)
{
assert(Fun!=0);
Default();
m_Fun4=Fun;
}
NormalEvent(FUN5 Fun)
{
assert(Fun!=0);
Default();
m_Fun5=Fun;
}
NormalEvent(FUN6 Fun)
{
assert(Fun!=0);
Default();
m_Fun6=Fun;
}
NormalEvent(FUN7 Fun)
{
assert(Fun!=0);
Default();
m_Fun7=Fun;
}
NormalEvent(FUN8 Fun)
{
assert(Fun!=0);
Default();
m_Fun8=Fun;
}
NormalEvent(FUN9 Fun)
{
assert(Fun!=0);
Default();
m_Fun9=Fun;
}
NormalEvent(FUN10 Fun)
{
assert(Fun!=0);
Default();
m_Fun10=Fun;
}
NormalEvent(FUN11 Fun)
{
assert(Fun!=0);
Default();
m_Fun11=Fun;
}
NormalEvent(FUN12 Fun)
{
assert(Fun!=0);
Default();
m_Fun12=Fun;
}
virtual RT Invoke()
{
assert(m_Fun0!=0);
return (*m_Fun0)();
}
virtual RT Invoke(T0 _0)
{
assert(m_Fun1!=0);
return(*m_Fun1)(_0);
}
virtual RT Invoke(T0 _0 , T1 _1)
{
assert(m_Fun2!=0);
return(*m_Fun2)(_0,_1);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2)
{
assert(m_Fun3!=0);
return(*m_Fun3)(_0,_1,_2);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3)
{
assert(m_Fun4!=0);
return(*m_Fun4)(_0,_1,_2,_3);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4)
{
assert(m_Fun5!=0);
return(*m_Fun5)(_0,_1,_2,_3,_4);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5)
{
assert(m_Fun6!=0);
return(*m_Fun6)(_0,_1,_2,_3,_4,_5);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6)
{
assert(m_Fun7!=0);
return(*m_Fun7)(_0,_1,_2,_3,_4,_5,_6);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7)
{
assert(m_Fun8!=0);
return(*m_Fun8)(_0,_1,_2,_3,_4,_5,_6,_7);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8)
{
assert(m_Fun9!=0);
return(*m_Fun9)(_0,_1,_2,_3,_4,_5,_6,_7,_8);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9)
{
assert(m_Fun10!=0);
return(*m_Fun10)(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10)
{
assert(m_Fun11!=0);
return(*m_Fun11)(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10 , T11 _11)
{
assert(m_Fun12!=0);
return(*m_Fun12)(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11);
}
};
template
<
typename RT
>
BaseEvent
{
return new NormalEvent
}
template
<
typename RT,typename T0
>
BaseEvent*EventHandler(RT (*fun)(T0))
{
return new NormalEvent(fun);
}
template
<
typename RT,typename T0,typename T1
>
BaseEvent*EventHandler(RT (*fun)(T0,T1))
{
return new NormalEvent(fun);
}
template
<
typename RT,typename T0,typename T1,typename T2
>
BaseEvent*EventHandler(RT (*fun)(T0,T1,T2))
{
return new NormalEvent(fun);
}
template
<
typename RT,typename T0,typename T1,typename T2,typename T3
>
BaseEvent*EventHandler(RT (*fun)(T0,T1,T2,T3))
{
return new NormalEvent(fun);
}
template
<
typename RT,
typename T0,typename T1,typename T2,typename T3,typename T4
>
BaseEvent*EventHandler(RT (*fun)(T0,T1,T2,T3,T4))
{
return new NormalEvent(fun);
}
template
<
typename RT,
typename T0,typename T1,typename T2,typename T3,typename T4,
typename T5
>
BaseEvent*EventHandler(RT (*fun)(T0,T1,T2,T3,T4,T5))
{
return new NormalEvent(fun);
}
template
<
typename RT,
typename T0,typename T1,typename T2,typename T3,typename T4,
typename T5,typename T6
>
BaseEvent*EventHandler(RT (*fun)(T0,T1,T2,T3,T4,T5,T6))
{
return new NormalEvent(fun);
}
template
<
typename RT,
typename T0,typename T1,typename T2,typename T3,typename T4,
typename T5,typename T6,typename T7
>
BaseEvent*EventHandler(RT (*fun)(T0,T1,T2,T3,T4,T5,T6,T7))
{
return new NormalEvent(fun);
}
template
<
typename RT,
typename T0,typename T1,typename T2,typename T3,typename T4,
typename T5,typename T6,typename T7,typename T8
>
BaseEvent*EventHandler(RT (*fun)(T0,T1,T2,T3,T4,T5,T6,T7,T8))
{
return new NormalEvent(fun);
}
template
<
typename RT,
typename T0,typename T1,typename T2,typename T3,typename T4,
typename T5,typename T6,typename T7,typename T8,typename T9
>
BaseEvent*EventHandler(RT (*fun)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9))
{
return new NormalEvent(fun);
}
template
<
typename RT,
typename T0,typename T1,typename T2,typename T3,typename T4,
typename T5,typename T6,typename T7,typename T8,typename T9,
typename T10
>
BaseEvent*EventHandler(RT (*fun)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10))
{
return new NormalEvent(fun);
}
template
<
typename RT,
typename T0,typename T1,typename T2,typename T3,typename T4,
typename T5,typename T6,typename T7,typename T8,typename T9,
typename T10,typename T11
>
BaseEvent*EventHandler(RT (*fun)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11))
{
return new NormalEvent(fun);
}
template
<
typename C,
typename RT,
typename T0 = null_event,typename T1 = null_event,typename T2 = null_event,typename T3 = null_event,
typename T4 = null_event,typename T5 = null_event,typename T6 = null_event,typename T7 = null_event,
typename T8 = null_event,typename T9 = null_event,typename T10 = null_event,typename T11 = null_event
>
class MemberEvent:public BaseEvent
{
private:
typedef RT (C::*FUN0) ();
typedef RT (C::*FUN1) (T0);
typedef RT (C::*FUN2) (T0,T1);
typedef RT (C::*FUN3) (T0,T1,T2);
typedef RT (C::*FUN4) (T0,T1,T2,T3);
typedef RT (C::*FUN5) (T0,T1,T2,T3,T4);
typedef RT (C::*FUN6) (T0,T1,T2,T3,T4,T5);
typedef RT (C::*FUN7) (T0,T1,T2,T3,T4,T5,T6);
typedef RT (C::*FUN8) (T0,T1,T2,T3,T4,T5,T6,T7);
typedef RT (C::*FUN9) (T0,T1,T2,T3,T4,T5,T6,T7,T8);
typedef RT (C::*FUN10)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9);
typedef RT (C::*FUN11)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10);
typedef RT (C::*FUN12)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11);
private:
FUN0 m_Fun0;
FUN1 m_Fun1;
FUN2 m_Fun2;
FUN3 m_Fun3;
FUN4 m_Fun4;
FUN5 m_Fun5;
FUN6 m_Fun6;
FUN7 m_Fun7;
FUN8 m_Fun8;
FUN9 m_Fun9;
FUN10 m_Fun10;
FUN11 m_Fun11;
FUN12 m_Fun12;
C *m_Object;
void Default()
{
m_Fun0=0;
m_Fun1=0;
m_Fun2=0;
m_Fun3=0;
m_Fun4=0;
m_Fun5=0;
m_Fun6=0;
m_Fun7=0;
m_Fun8=0;
m_Fun9=0;
m_Fun10=0;
m_Fun11=0;
m_Fun12=0;
m_Object=0;
}
public:
MemberEvent(C*pObject,FUN0 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun0=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN1 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun1=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN2 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun2=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN3 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun3=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN4 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun4=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN5 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun5=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN6 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun6=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN7 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun7=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN8 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun8=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN9 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun9=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN10 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun10=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN11 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun11=Fun;
m_Object=pObject;
}
MemberEvent(C*pObject,FUN12 Fun)
{
assert(pObject!=0 && Fun!=0);
Default();
m_Fun12=Fun;
m_Object=pObject;
}
virtual RT Invoke()
{
assert(m_Object!=0);
assert(m_Fun0!=0);
return (m_Object->*m_Fun0)();
}
virtual RT Invoke(T0 _0)
{
assert(m_Object!=0);
assert(m_Fun1!=0);
return(m_Object->*m_Fun1)(_0);
}
virtual RT Invoke(T0 _0 , T1 _1)
{
assert(m_Object!=0);
assert(m_Fun2!=0);
return(m_Object->*m_Fun2)(_0,_1);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2)
{
assert(m_Object!=0);
assert(m_Fun3!=0);
return(m_Object->*m_Fun3)(_0,_1,_2);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3)
{
assert(m_Object!=0);
assert(m_Fun4!=0);
return(m_Object->*m_Fun4)(_0,_1,_2,_3);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4)
{
assert(m_Object!=0);
assert(m_Fun5!=0);
return(m_Object->*m_Fun5)(_0,_1,_2,_3,_4);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5)
{
assert(m_Object!=0);
assert(m_Fun6!=0);
return(m_Object->*m_Fun6)(_0,_1,_2,_3,_4,_5);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6)
{
assert(m_Object!=0);
assert(m_Fun7!=0);
return(m_Object->*m_Fun7)(_0,_1,_2,_3,_4,_5,_6);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7)
{
assert(m_Object!=0);
assert(m_Fun8!=0);
return(m_Object->*m_Fun8)(_0,_1,_2,_3,_4,_5,_6,_7);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8)
{
assert(m_Object!=0);
assert(m_Fun9!=0);
return(m_Object->*m_Fun9)(_0,_1,_2,_3,_4,_5,_6,_7,_8);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9)
{
assert(m_Object!=0);
assert(m_Fun10!=0);
return(m_Object->*m_Fun10)(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10)
{
assert(m_Object!=0);
assert(m_Fun11!=0);
return(m_Object->*m_Fun11)(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10);
}
virtual RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10 , T11 _11)
{
assert(m_Object!=0);
assert(m_Fun12!=0);
return(m_Object->*m_Fun12)(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11);
}
};
template
<
typename C,typename RT
>
BaseEvent
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2,typename T3
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2,T3))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2,typename T3,
typename T4
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2,T3,T4))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2,typename T3,
typename T4,typename T5
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2,T3,T4,T5))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2,typename T3,
typename T4,typename T5,typename T6
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2,T3,T4,T5,T6))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2,typename T3,
typename T4,typename T5,typename T6,typename T7
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2,T3,T4,T5,T6,T7))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2,typename T3,
typename T4,typename T5,typename T6,typename T7,typename T8
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2,T3,T4,T5,T6,T7,T8))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2,typename T3,
typename T4,typename T5,typename T6,typename T7,typename T8,typename T9
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2,typename T3,
typename T4,typename T5,typename T6,typename T7,typename T8,typename T9,
typename T10
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10))
{
return new MemberEvent(obj,fun);
}
template
<
typename C,typename RT,typename T0,typename T1,typename T2,typename T3,
typename T4,typename T5,typename T6,typename T7,typename T8,typename T9,
typename T10,typename T11
>
BaseEvent*EventHandler(C*obj,RT (C::*fun)(T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10,T11))
{
return new MemberEvent(obj,fun);
}
template
<
typename RT,
typename T0 = null_event,typename T1 = null_event,typename T2 = null_event,typename T3 = null_event,
typename T4 = null_event,typename T5 = null_event,typename T6 = null_event,typename T7 = null_event,
typename T8 = null_event,typename T9 = null_event,typename T10 = null_event,typename T11 = null_event
>
class __Event
{
typedef BaseEvent*eventHandler;
private:
eventHandler m_EventHandler;
public:
bool IsValid()const
{
if(m_EventHandler!=0)
return true;
else
return false;
}
public:
__Event()
{
m_EventHandler=0;
}
virtual~__Event()
{
if(m_EventHandler!=0)
{
delete m_EventHandler;
m_EventHandler=0;
}
}
void operator=(BaseEvent*event)
{
if(m_EventHandler!=0)
{
delete m_EventHandler;
m_EventHandler=0;
}
m_EventHandler=event;
}
RT Invoke()
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke();
}
RT Invoke(T0 _0)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0);
}
RT Invoke(T0 _0 , T1 _1)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1);
}
RT Invoke(T0 _0 , T1 _1 , T2 _2)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2);
}
RT Invoke(T0 _0,T1 _1,T2 _2,T3 _3)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3);
}
RT Invoke(T0 _0,T1 _1,T2 _2,T3 _3 , T4 _4)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4);
}
RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5);
}
RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5,_6);
}
RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5,_6,_7);
}
RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5,_6,_7,_8);
}
RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9);
}
RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10);
}
RT Invoke(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10 , T11 _11)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3 ,_4,_5,_6,_7,_8,_9,_10,_11);
}
RT operator()()
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke();
}
RT operator()(T0 _0)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0);
}
RT operator()(T0 _0 , T1 _1)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1);
}
RT operator()(T0 _0 , T1 _1 , T2 _2)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2);
}
RT operator()(T0 _0,T1 _1,T2 _2,T3 _3)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3);
}
RT operator()(T0 _0,T1 _1,T2 _2,T3 _3 , T4 _4)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4);
}
RT operator()(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5);
}
RT operator()(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5,_6);
}
RT operator()(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5,_6,_7);
}
RT operator()(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5,_6,_7,_8);
}
RT operator()(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9);
}
RT operator()(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10);
}
RT operator()(T0 _0 , T1 _1 , T2 _2 , T3 _3 , T4 _4 , T5 _5 , T6 _6 , T7 _7 , T8 _8 , T9 _9 , T10 _10 , T11 _11)
{
assert(m_EventHandler!=0);
return m_EventHandler->Invoke(_0,_1,_2,_3 ,_4,_5,_6,_7,_8,_9,_10,_11);
}
};
}//KtyGE
#endif//__EVENT_INCLUDE
以下为一示例。大家可以参考着使用：
#include "Event.H"
#include
using namespace std;
void ProcArg3(int a,int b,int c)
{
cout<<"Call In ProcArg3."<
}
void ProcArg2(int a,int b)
{
cout<<"Call In ProcArg2."<
}
class Test
{
private:
void ProcArg1(int )
{
cout<<"Call In Test::ProcArg1."<
}
void ProcArg0()
{
cout<<"Call In Test::ProcArg0."<
}
public:
__Event OnArg3Func;
__Event OnArg2Func;
__Event OnArg1Func;
__Event OnArg0Func;
Test()
{
OnArg3Func=EventHandler(ProcArg3); //外部函数处理事件
OnArg2Func=EventHandler(ProcArg2); //不同参数的处理
OnArg1Func=EventHandler(this,ProcArg1); //类成员函数事件处理
OnArg0Func=EventHandler(this,ProcArg0);
}
void Invoke()
{
OnArg0Func.Invoke();
OnArg1Func.Invoke(0);
OnArg2Func.Invoke(0,0);
OnArg3Func.Invoke(0,0,0) ; //调用事件
}
};
void main()
{
Test *t=new Test;
t->Invoke();
cin.get();
}
后记
原本，我以为在
C++中用软件是无法成功实现
C#中的委托的，但是在我实现的那一刻起，我知道
C++语言的灵活，有些是你难以想到的。在
2006年到来之际，谨以此文，献给所有的
C++爱好者。如果有用词不当，或是不明了的地方，请与我联系。
QQ:49448699
http://blog.csdn.net/baickl