Posted on 2010-11-15 22:35
魔のkyo 阅读(3369)
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以前一直以为用标准C++无法实现类似委托或者信号与槽的机制。
还写过一篇BLOG
http://www.cnitblog.com/luckydmz/archive/2009/11/23/62785.html看来我还是“太年轻”，无知啊。
#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;
template<class T1>
class SlotBase
{
public:
virtual void Exec(T1 param1) = 0;
};
template<class T, class T1>
class SlotImpl : public SlotBase<T1>
{
public:
SlotImpl(T* pObj, void (T::*func)(T1) )
{
m_pObj = pObj;
m_Func = func;
}
void Exec( T1 param1)
{
(m_pObj->*m_Func)(param1);
}
private:
T* m_pObj;
void (T::*m_Func)(T1);
};
template<class T1>
class Slot
{
public:
template<class T>
Slot(T* pObj, void (T::*func)(T1))
{
m_pSlotBase = new SlotImpl<T,T1>(pObj, func);
}
~Slot()
{
delete m_pSlotBase;
}
void Exec(T1 param1)
{
m_pSlotBase->Exec(param1);
}
private:
SlotBase<T1>* m_pSlotBase;
};
template<class T1>
class Signal
{
public:
template<class T>
void Bind(T* pObj, void (T::*func)(T1))
{
m_pSlotSet.push_back( new Slot<T1>(pObj,func) );
}
~Signal()
{
for(int i=0;i<(int)m_pSlotSet.size();i++)
{
delete m_pSlotSet[i];
}
}
void operator()(T1 param1)
{
for(int i=0;i<(int)m_pSlotSet.size();i++)
{
m_pSlotSet[i]->Exec(param1);
}
}
private:
vector< Slot<T1>* > m_pSlotSet;
};
#define Connect( sender, signal, receiver, method) ( (sender)->signal.Bind(receiver, method) )
class A
{
public:
void FuncOfA(int param)
{
printf("A::FuncOfA(%d)\n", param);
}
};
class B
{
public:
void FuncOfB(int param)
{
printf("B::FuncOfB(%d)\n", param);
}
};
class C
{
public:
C()
{
m_Value = 0;
}
void SetValue(int value)
{
if(m_Value != value)
{
m_Value = value;
ValueChanged(m_Value);
}
}
public:
Signal<int> ValueChanged;
private:
int m_Value;
};
int main()
{
A* pA = new A;
B* pB = new B;
C* pC = new C;
Connect(pC, ValueChanged, pA, &A::FuncOfA);
Connect(pC, ValueChanged, pB, &B::FuncOfB);
pC->SetValue(10);
pC->SetValue(5);
pC->SetValue(5);
delete pC;
delete pB;
delete pA;
scanf("%*s");
}