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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