Читать «Делегаты на C++» онлайн - страница 5
Александр Шаргин
Окончательная версия делегата, обобщённая с помощью всех этих макросов, будет выглядеть так:
template‹class TRet TEMPLATE_PARAMS›
class I_DELEGATE {
public:
virtual ~I_DELEGATE() {}
virtual TRet Invoke(PARAMS) = 0;
virtual bool Compare(I_DELEGATE‹TRet TEMPLATE_ARGS›* pDelegate) = 0;
};
template‹class TRet TEMPLATE_PARAMS›
class C_STATIC_DELEGATE: public I_DELEGATE‹TRet TEMPLATE_ARGS› {
public:
typedef TRet (*PFunc)(PARAMS);
C_STATIC_DELEGATE(PFunc pFunc) { m_pFunc = pFunc; }
virtual TRet Invoke(PARAMS) { return m_pFunc(ARGS); }
virtual bool Compare(I_DELEGATE‹TRet TEMPLATE_ARGS›* pDelegate) {
C_STATIC_DELEGATE‹TRet TEMPLATE_ARGS›* pStaticDel = dynamic_cast‹C_STATIC_DELEGATE‹TRet TEMPLATE_ARGS›*›(pDelegate);
if (pStaticDel == NULL || pStaticDel-›m_pFunc != m_pFunc) return false;
return true;
}
private:
PFunc m_pFunc;
};
template‹class TObj, class TRet TEMPLATE_PARAMS›
class C_METHOD_DELEGATE: public I_DELEGATE‹TRet TEMPLATE_ARGS› {
public:
typedef TRet (TObj::*PMethod)(PARAMS);
C_METHOD_DELEGATE(TObj* pObj, PMethod pMethod) {
m_pObj = pObj;
m_pMethod = pMethod;
}
virtual TRet Invoke(PARAMS) { return (m_pObj-›*m_pMethod)(ARGS); }
virtual bool Compare(I_DELEGATE‹TRet TEMPLATE_ARGS›* pDelegate) {
C_METHOD_DELEGATE‹TObj, TRet TEMPLATE_ARGS›* pMethodDel = dynamic_cast‹C_METHOD_DELEGATE‹TObj, TRet TEMPLATE_ARGS›*›(pDelegate);
if (pMethodDel == NULL || pMethodDel-›m_pObj != m_pObj || pMethodDel-›m_pMethod != m_pMethod) { return false; }
return true;
}
private:
TObj *m_pObj;
PMethod m_pMethod;
};
template‹class TRet TEMPLATE_PARAMS›
I_DELEGATE‹TRet TEMPLATE_ARGS›* NewDelegate(TRet (*pFunc)(PARAMS)) {
return new C_STATIC_DELEGATE‹TRet TEMPLATE_ARGS›(pFunc);
}
template ‹class TObj, class TRet TEMPLATE_PARAMS›
I_DELEGATE‹TRet TEMPLATE_ARGS›* NewDelegate(TObj* pObj, TRet (TObj::*pMethod)(PARAMS)) {
return new C_METHOD_DELEGATE‹TObj, TRet TEMPLATE_ARGS› (pObj, pMethod);
}
template‹class TRet TEMPLATE_PARAMS›
class C_DELEGATE {
public:
typedef I_DELEGATE‹TRet TEMPLATE_ARGS› IDelegate;
typedef std::list‹IDelegate*› DelegateList;
C_DELEGATE(IDelegate* pDelegate = NULL) { Add(pDelegate); }
~C_DELEGATE() { RemoveAll(); }
bool IsNull() { return (m_DelegateList.empty()); }
C_DELEGATE‹TRet TEMPLATE_ARGS›& operator=(IDelegate* pDelegate) {
RemoveAll();
Add(pDelegate);
return *this;
}
C_DELEGATE‹TRet TEMPLATE_ARGS›& operator+=(IDelegate* pDelegate) {
Add(pDelegate);
return *this;
}
C_DELEGATE‹TRet TEMPLATE_ARGS›& operator-=(IDelegate* pDelegate) {
Remove(pDelegate);
return *this;
}
TRet operator()(PARAMS) {
return Invoke(ARGS);
}
private:
void Add(IDelegate* pDelegate) {
if(pDelegate != NULL) m_DelegateList.push_back(pDelegate);
}
void Remove(IDelegate* pDelegate) {
