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wangzhankun/C++事件机制.cpp

Created March 22, 2021 01:40
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C++事件机制
Raw
C++事件机制.cpp
#pragma once
#include <map>
#include <functional>
namespace Utility
{
namespace Private
{
struct NullType
{
};
template <class HandlerT>
class EventBase
{
public:
EventBase() : m_handlerId(0) {}
template <class FuncT>
int addHandler(FuncT func)
{
m_handlers.emplace(m_handlerId, std::forward<FuncT>(func));
return m_handlerId++;
}
void removeHandler(int handlerId)
{
m_handlers.erase(handlerId);
}
protected:
int m_handlerId;
std::map<int, std::function<HandlerT>> m_handlers;
};
}
template <class P1 = Private::NullType, class P2 = Private::NullType, class P3 = Private::NullType, class P4 = Private::NullType, class P5 = Private::NullType, class P6 = Private::NullType, class P7 = Private::NullType, class P8 = Private::NullType, class P9 = Private::NullType, class P10 = Private::NullType>
class Event
: public Private::EventBase<void(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10)>
{
public:
using Private::EventBase<void(P1, P2, P3, P4, P5, P6, P7, P8, P9, P10)>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT obj, FuncT func)
{
using namespace std::placeholders;
m_handlers.emplace(m_handlerId, std::bind(func, std::forward<ObjT>(obj), _1, _2, _3, _4, _5, _6, _7, _8, _9, _10));
return m_handlerId++;
}
void operator()(P1 arg1, P2 arg2, P3 arg3, P4 arg4, P5 arg5, P6 arg6, P7 arg7, P8 arg8, P9 arg9, P10 arg10)
{
for (const auto &i : m_handlers)
i.second(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
}
};
template <>
class Event<Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType>
: public Private::EventBase<void()>
{
public:
using Private::EventBase<void()>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT const obj, FuncT func)
{
m_handlers.emplace(m_handlerId, std::bind(func, obj));
return m_handlerId++;
}
void operator()()
{
for (const auto &i : m_handlers)
i.second();
}
};
template <class P1>
class Event<P1, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType>
: public Private::EventBase<void(P1)>
{
public:
using Private::EventBase<void(P1)>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT obj, FuncT func)
{
using namespace std::placeholders;
m_handlers.emplace(m_handlerId, std::bind(func, std::forward<ObjT>(obj), _1));
return m_handlerId++;
}
void operator()(P1 arg1)
{
for (const auto &i : m_handlers)
i.second(arg1);
}
};
template <class P1, class P2>
class Event<P1, P2, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType>
: public Private::EventBase<void(P1, P2)>
{
public:
using Private::EventBase<void(P1, P2)>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT obj, FuncT func)
{
using namespace std::placeholders;
m_handlers.emplace(m_handlerId, std::bind(func, std::forward<ObjT>(obj), _1, _2));
return m_handlerId++;
}
void operator()(P1 arg1, P2 arg2)
{
for (const auto &i : m_handlers)
i.second(arg1, arg2);
}
};
template <class P1, class P2, class P3>
class Event<P1, P2, P3, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType>
: public Private::EventBase<void(P1, P2, P3)>
{
public:
using Private::EventBase<void(P1, P2, P3)>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT obj, FuncT func)
{
using namespace std::placeholders;
m_handlers.emplace(m_handlerId, std::bind(func, std::forward<ObjT>(obj), _1, _2, _3));
return m_handlerId++;
}
void operator()(P1 arg1, P2 arg2, P3 arg3)
{
for (const auto &i : m_handlers)
i.second(arg1, arg2, arg3);
}
};
template <class P1, class P2, class P3, class P4>
class Event<P1, P2, P3, P4, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType>
: public Private::EventBase<void(P1, P2, P3, P4)>
{
public:
using Private::EventBase<void(P1, P2, P3, P4)>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT obj, FuncT func)
{
using namespace std::placeholders;
m_handlers.emplace(m_handlerId, std::bind(func, std::forward<ObjT>(obj), _1, _2, _3, _4));
return m_handlerId++;
}
void operator()(P1 arg1, P2 arg2, P3 arg3, P4 arg4)
{
for (const auto &i : m_handlers)
i.second(arg1, arg2, arg3, arg4);
}
};
template <class P1, class P2, class P3, class P4, class P5>
class Event<P1, P2, P3, P4, P5, Private::NullType, Private::NullType, Private::NullType, Private::NullType, Private::NullType>
: public Private::EventBase<void(P1, P2, P3, P4, P5)>
{
public:
using Private::EventBase<void(P1, P2, P3, P4, P5)>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT obj, FuncT func)
{
using namespace std::placeholders;
m_handlers.emplace(m_handlerId, std::bind(func, std::forward<ObjT>(obj), _1, _2, _3, _4, _5));
return m_handlerId++;
}
void operator()(P1 arg1, P2 arg2, P3 arg3, P4 arg4, P5 arg5)
{
for (const auto &i : m_handlers)
i.second(arg1, arg2, arg3, arg4, arg5);
}
};
template <class P1, class P2, class P3, class P4, class P5, class P6>
class Event<P1, P2, P3, P4, P5, P6, Private::NullType, Private::NullType, Private::NullType, Private::NullType>
: public Private::EventBase<void(P1, P2, P3, P4, P5, P6)>
{
public:
using Private::EventBase<void(P1, P2, P3, P4, P5, P6)>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT obj, FuncT func)
{
using namespace std::placeholders;
m_handlers.emplace(m_handlerId, std::bind(func, std::forward<ObjT>(obj), _1, _2, _3, _4, _5, _6));
return m_handlerId++;
}
void operator()(P1 arg1, P2 arg2, P3 arg3, P4 arg4, P5 arg5, P6 arg6)
{
for (const auto &i : m_handlers)
i.second(arg1, arg2, arg3, arg4, arg5, arg6);
}
};
template <class P1, class P2, class P3, class P4, class P5, class P6, class P7>
class Event<P1, P2, P3, P4, P5, P6, P7, Private::NullType, Private::NullType, Private::NullType>
: public Private::EventBase<void(P1, P2, P3, P4, P5, P6, P7)>
{
public:
using Private::EventBase<void(P1, P2, P3, P4, P5, P6, P7)>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT obj, FuncT func)
{
using namespace std::placeholders;
m_handlers.emplace(m_handlerId, std::bind(func, std::forward<ObjT>(obj), _1, _2, _3, _4, _5, _6, _7));
return m_handlerId++;
}
void operator()(P1 arg1, P2 arg2, P3 arg3, P4 arg4, P5 arg5, P6 arg6, P7 arg7)
{
for (const auto &i : m_handlers)
i.second(arg1, arg2, arg3, arg4, arg5, arg6, arg7);
}
};
template <class P1, class P2, class P3, class P4, class P5, class P6, class P7, class P8>
class Event<P1, P2, P3, P4, P5, P6, P7, P8, Private::NullType, Private::NullType>
: public Private::EventBase<void(P1, P2, P3, P4, P5, P6, P7, P8)>
{
public:
using Private::EventBase<void(P1, P2, P3, P4, P5, P6, P7, P8)>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT obj, FuncT func)
{
using namespace std::placeholders;
m_handlers.emplace(m_handlerId, std::bind(func, std::forward<ObjT>(obj), _1, _2, _3, _4, _5, _6, _7, _8));
return m_handlerId++;
}
void operator()(P1 arg1, P2 arg2, P3 arg3, P4 arg4, P5 arg5, P6 arg6, P7 arg7, P8 arg8)
{
for (const auto &i : m_handlers)
i.second(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
}
};
template <class P1, class P2, class P3, class P4, class P5, class P6, class P7, class P8, class P9>
class Event<P1, P2, P3, P4, P5, P6, P7, P8, P9, Private::NullType>
: public Private::EventBase<void(P1, P2, P3, P4, P5, P6, P7, P8, P9)>
{
public:
using Private::EventBase<void(P1, P2, P3, P4, P5, P6, P7, P8, P9)>::addHandler;
template <class ObjT, class FuncT>
int addHandler(ObjT obj, FuncT func)
{
using namespace std::placeholders;
m_handlers.emplace(m_handlerId, std::bind(func, std::forward<ObjT>(obj), _1, _2, _3, _4, _5, _6, _7, _8, _9));
return m_handlerId++;
}
void operator()(P1 arg1, P2 arg2, P3 arg3, P4 arg4, P5 arg5, P6 arg6, P7 arg7, P8 arg8, P9 arg9)
{
for (const auto &i : m_handlers)
i.second(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9);
}
};
} // namespace Utility
Raw
test.cpp
#include "Event.h"
using namespace std;
void f1(int, int)
{
puts("f1()");
}
struct F2
{
F2() { puts("F2 construct"); }
F2(const F2 &) { puts("F2 copy"); }
F2(F2 &&) { puts("F2 move"); }
F2 &operator=(const F2 &)
{
puts("F2 copy assign");
return *this;
}
F2 &operator=(F2 &&)
{
puts("F2 move assign");
return *this;
}
void f(int, int)
{
puts("f2()");
}
void fc(int, int) const
{
puts("f2c()");
}
};
struct F3
{
F3() { puts("F3 construct"); }
F3(const F3 &) { puts("F3 copy"); }
F3(F3 &&) { puts("F3 move"); }
F3 &operator=(const F3 &)
{
puts("F3 copy assign");
return *this;
}
F3 &operator=(F3 &&)
{
puts("F3 move assign");
return *this;
}
void operator()(int, int) const
{
puts("f3()");
}
};
int _tmain(int argc, _TCHAR *argv[])
{
Utility::Event<int, int> e;
// 一般函数
e.addHandler(f1);
int id = e.addHandler(&f1);
e.removeHandler(id); // 移除事件处理函数
// 成员函数
using namespace std::placeholders;
F2 f2;
const F2 *pf2 = &f2;
e.addHandler(bind(&F2::f, &f2, _1, _2)); // std::bind
e.addHandler(&f2, &F2::f);
e.addHandler(pf2, &F2::fc); // 常量指针
puts("----addHandler(f2, &F2::f)----");
e.addHandler(f2, &F2::f); // 对象拷贝构造
puts("----addHandler(F2(), &F2::f)----");
e.addHandler(F2(), &F2::f); // 对象转移构造
puts("--------");
// 仿函数
F3 f3;
const F3 *pf3 = &f3;
puts("----addHandler(f3)----");
e.addHandler(f3); // 对象拷贝构造
puts("----addHandler(F3())----");
e.addHandler(F3()); // 对象转移构造
puts("--------");
e.addHandler(ref(f3)); // 引用仿函数对象
e.addHandler(ref(*pf3)); // 引用仿函数常量对象
puts("--------");
// Lambda表达式
e.addHandler([](int, int) {
puts("f4()");
});
// 激发事件
e(1, 2);
return 0;
}
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