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用 C++ 实现 C# 中的 委托/事件 (1-delegateEMU.cpp)

王朝c#·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

前两天看程序员杂志

看到关于 C# 中的委托/事件

觉得用起来好像是挺方便的

本人热衷于 C++

想想用 C++ 来模拟似乎也可以

于是就有了下面的代码...

(VC6 不支持偏特化 本人工作环境就是 VC6 痛啊~~~)

没有返回值的函数用 delegate

否则就用 delegate_rt

functor 也一样 functorN/functorN_rt

delegate 的模板参数可以是函数指针(非成员函数)

也可以是 functor

还可以是 delegate

functor 可用 make_functor/make_functor_rt 来生成

要是有偏特化 就可以去掉讨厌的 _rt 了 :(

关于委托 boost里有现成的

不过可能 VC6 里用不了

这些代码旨在个人研究

如果大家发现其中问题 希望能指出

//filename: delegateEMU.cpp

#include <stdio.h>

#pragma warning(disable:4786)

#include "delegate.h"

#include "event.h"

#include "functor.h"

#include <functional>

class MyEventArgs : public EventArgs

{

public:

MyEventArgs(const char* Context = "") : context(Context) {}

const char* context;

};

typedef delegate<void (*)(object, MyEventArgs&)> EventHandler1;

typedef delegate<functor2<object, MyEventArgs&> > EventHandler2;

class Provider

{

public: event<EventHandler1> OkClick1;

public: event<EventHandler2> OkClick2;

};

static void global_Process_OkClick(object source, MyEventArgs& e)

{

printf("global_Process_OkClick, \t%s\n", e.context);

}

class Master_base

{

public:

public: Provider pro;

public: Master_base()

{

pro.OkClick1 += EventHandler1(static_Process_OkClick);

pro.OkClick2 += EventHandler2(

make_functor(this, &Master_base::Process_OkClick));

pro.OkClick2 += EventHandler2(

make_functor(&Master_base::static_Process_OkClick));

pro.OkClick2 += EventHandler2(

make_functor(global_Process_OkClick));

}

protected: void Process_OkClick(object source, MyEventArgs& e)

{

printf(" Process_OkClick, \t%s\n", e.context);

}

public: static void static_Process_OkClick(object source, MyEventArgs& e)

{

printf("static_Process_OkClick, \t%s\n", e.context);

}

public: virtual void test_virtual() const

{

printf("Master_base::test_virtual const\n");

}

public: void mem_func__()

{

printf("Master_base::mem_func__\n");

}

public: void mem_func__int(int x)

{

printf("Master_base::mem_func__int %d\n", x);

}

public: void mem_func__int_str(int x, const char* str)

{

printf("Master_base::mem_func__int %d %s\n", x, str);

}

public: int mem_func_int_()

{

printf("Master_base::mem_func_int_\n");

return 123;

}

public: int mem_func_int_int(int x)

{

printf("Master_base::mem_func_int_int %d\n", x);

return x;

}

public: int mem_func_int_int_str(int x, const char* str)

{

printf("Master_base::mem_func_int_int %d %s\n", x, str);

return x;

}

};

class Master_derived: public Master_base

{

public: Master_derived()

{

pro.OkClick1 += EventHandler1(static_Process_OkClick_Myself);

pro.OkClick2 += EventHandler2(

make_functor(this, &Master_derived::Process_OkClick_Myself));

pro.OkClick2 -= EventHandler2(

make_functor((Master_base*)this, &Master_base::Process_OkClick));

pro.OkClick2 -= EventHandler2(

make_functor(this, &Master_derived::Process_OkClick_Myself1));

pro.OkClick2 += EventHandler2(

make_functor(&Master_derived::static_Process_OkClick_Myself));

pro.OkClick2 -= EventHandler2(

make_functor(global_Process_OkClick));

}

protected: void Process_OkClick_Myself(object source, MyEventArgs& e)

{

printf(" Process_OkClick_Myself, \t%s\n", e.context);

}

private: void Process_OkClick_Myself1(object source, MyEventArgs& e)

{

printf(" Process_OkClick_Myself1, \t%s\n", e.context);

}

static void static_Process_OkClick_Myself(object source, MyEventArgs& e)

{

printf("static_Process_OkClick_Myself, \t%s\n", e.context);

}

public: virtual void test_virtual() const

{

printf("Master_derived::test_virtual const\n");

}

};

class MainClass

{

public:

void Main()

{

Master_base example1;

Master_derived example2;

printf(" example1.pro.OkClick1:\n");

example1.pro.OkClick1(this, MyEventArgs("example1.pro.OkClick1"));

printf(" example2.pro.OkClick1:\n");

example2.pro.OkClick1(this, MyEventArgs("example2.pro.OkClick1"));

printf("\n");

printf(" example1.pro.OkClick2:\n");

example1.pro.OkClick2(this, MyEventArgs("example1.pro.OkClick2"));

printf(" example2.pro.OkClick2:\n");

example2.pro.OkClick2(this, MyEventArgs("example2.pro.OkClick2"));

}

};

void testfunc__()

{

printf("testfunc__\n");

}

void testfunc__int(int i)

{

printf("testfunc__int %d\n", i);

}

void testfunc__int_str(int i, const char* j)

{

printf("testfunc__int_str %d %s\n", i, j);

}

int testfunc_int_()

{

printf("testfunc_int_\n");

return 111;

}

int testfunc_int_int(int i)

{

printf("testfunc_int_int %d\n", i);

return i;

}

int testfunc_int_int_str(int i, const char* j)

{

printf("testfunc_int_int_str %d %s\n", i, j);

return i;

}

typedef void (*func__)();

typedef void (*func__int)(int);

typedef void (*func__int_str)(int, const char*);

typedef int (*func_int_)();

typedef int (*func_int_int)(int);

typedef int (*func_int_int_str)(int, const char*);

int main()

{

printf("event:\n");

MainClass().Main();

printf("\n functor:\n");

Master_base mb;

Master_derived md;

printf("\n func__:\n");

delegate<func__> ffunc__(testfunc__);

ffunc__ = delegate<func__>(testfunc__);

ffunc__ -= delegate<func__>(testfunc__);

ffunc__ += delegate<func__>(testfunc__);

ffunc__ = ffunc__ - delegate<func__>(testfunc__);

ffunc__ = ffunc__ + delegate<func__>(testfunc__);

ffunc__ = delegate<func__>(testfunc__) + ffunc__;

ffunc__ = testfunc__;

ffunc__ -= testfunc__;

ffunc__ += testfunc__;

ffunc__ = ffunc__ - testfunc__;

ffunc__ = ffunc__ + testfunc__;

ffunc__ = testfunc__ + ffunc__;

ffunc__();

printf(" functor.func__:\n");

delegate<functor0> ffunc__1(make_functor(testfunc__));

ffunc__1 += make_functor(&mb, &Master_base::mem_func__);

ffunc__1();

printf("\n func__int:\n");

delegate<func__int> ffunc__int(testfunc__int);

ffunc__int(888);

printf(" functor.func__int:\n");

delegate<functor1<int> > ffunc__int1(make_functor(testfunc__int));

ffunc__int1 += make_functor(&mb, &Master_base::mem_func__int);

ffunc__int1(777);

printf("\n func__int_str:\n");

delegate<func__int_str> ffunc__int_str(testfunc__int_str);

ffunc__int_str(888, "ccc");

printf(" functor.func__int_str:\n");

delegate<functor2<int, const char*> >

ffunc__int_str1(make_functor(testfunc__int_str));

ffunc__int_str1 += make_functor(&mb, &Master_base::mem_func__int_str);

ffunc__int_str1(777, "hhh");

printf("\n func_int_:\n");

delegate_rt<int, func_int_> ffunc_int_(testfunc_int_);

printf("ffunc_int_()=%d\n", ffunc_int_());

printf(" functor.func_int_:\n");

delegate_rt<int, functor0_rt<int> >

ffunc_int_1(make_functor_rt(testfunc_int_));

printf("ffunc_int_1()=%d\n", ffunc_int_1());

ffunc_int_1 -= make_functor_rt(testfunc_int_);

ffunc_int_1 += make_functor_rt(&mb, &Master_base::mem_func_int_);

printf("ffunc_int_1()=%d\n", ffunc_int_1());

printf("\n func_int_int:\n");

delegate_rt<int, func_int_int> ffunc_int_int(testfunc_int_int);

printf("ffunc_int_int()=%d\n", ffunc_int_int(888));

printf(" functor.func_int_int:\n");

delegate_rt<int, functor1_rt<int, int> >

ffunc_int_int1(make_functor_rt(testfunc_int_int));

printf("ffunc_int_int1()=%d\n", ffunc_int_int1(777));

ffunc_int_int1 -= make_functor_rt(testfunc_int_int);

ffunc_int_int1 += make_functor_rt(&mb, &Master_base::mem_func_int_int);

printf("ffunc_int_int1()=%d\n", ffunc_int_int1(777));

printf("\n func_int_int_str:\n");

delegate_rt<int, func_int_int_str> ffunc_int_int_str(testfunc_int_int_str);

printf("ffunc_int_int_str()=%d\n", ffunc_int_int_str(888, "ccc"));

printf(" functor.func_int_int_str:\n");

delegate_rt<int, functor2_rt<int, int, const char*> >

ffunc_int_int_str1(make_functor_rt(testfunc_int_int_str));

printf("ffunc_int_int_str1()=%d\n", ffunc_int_int_str1(777, "hhh"));

ffunc_int_int_str1 -= make_functor_rt(testfunc_int_int_str);

ffunc_int_int_str1 += make_functor_rt(&mb, &Master_base::mem_func_int_int_str);

printf("ffunc_int_int_str1()=%d\n", ffunc_int_int_str1(777, "hhh"));

printf("\nstatic function size:\t%d\n",

sizeof(&global_Process_OkClick));

printf("member function size:\t%d\n",

sizeof(&Master_base::mem_func__));

printf("virtual member function size:\t%d\n",

sizeof(&Master_base::test_virtual));

printf("\n");

delegate<functor0> ftest_virtual;

ftest_virtual = delegate<functor0>(ffunc__1)

+ delegate<functor0>(make_functor((Master_base*)&md,

&Master_base::test_virtual));

ftest_virtual();

printf(" test_virtual2:\n");

ftest_virtual = ftest_virtual

- make_functor(&md, &Master_derived::test_virtual);

ftest_virtual = ftest_virtual

+ make_functor(&mb, &Master_base::test_virtual);

ftest_virtual = make_functor(&mb, &Master_base::test_virtual)

+ ftest_virtual;

ftest_virtual();

printf("\n Test make_functor global:\n");

EventHandler2 teststatic1(make_functor(&global_Process_OkClick));

teststatic1((object)NULL, MyEventArgs());

MyEventArgs e;

functor2<object, MyEventArgs&>

teststatic2(make_functor(&global_Process_OkClick));

teststatic2((object)NULL, e);

make_functor(&global_Process_OkClick)(NULL, e);

printf("\n Test make_functor static member:\n");

EventHandler2 teststatic3(make_functor(&Master_base::static_Process_OkClick));

teststatic3((object)NULL, MyEventArgs());

functor2<object, MyEventArgs&>

teststatic4(make_functor(&Master_base::static_Process_OkClick));

teststatic4((object)NULL, e);

make_functor(&Master_base::static_Process_OkClick)(NULL, e);

std::vector<int> for_each_test(1, 1);

for_each_test.push_back(2);

for_each_test.push_back(3);

printf("\n for_each test ffunc__int:\n");

std::for_each(for_each_test.begin(), for_each_test.end(), ffunc__int);

printf("\n for_each test ffunc__int1:\n");

std::for_each(for_each_test.begin(), for_each_test.end(), ffunc__int1);

printf("\n for_each test ffunc_int_int:\n");

std::for_each(for_each_test.begin(), for_each_test.end(), ffunc_int_int);

printf("\n for_each test ffunc_int_int1:\n");

std::for_each(for_each_test.begin(), for_each_test.end(), ffunc_int_int1);

delegate<delegate<functor1<int> > > delegate_for_delegate_test(ffunc__int1);

delegate_for_delegate_test += ffunc__int1;

printf("\n delegate_for_delegate_test 1:\n");

std::for_each(for_each_test.begin(), for_each_test.end(),

delegate_for_delegate_test);

ffunc__int1 -= make_functor(testfunc__int);

delegate_for_delegate_test += ffunc__int1;

printf("\n delegate_for_delegate_test 2:\n");

std::for_each(for_each_test.begin(), for_each_test.end(),

delegate_for_delegate_test);

return 0;

}

 
 
 
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