一、函数指针——基本形式
char Fun(int n) { return char(n); }//char(*pFun)(int);void main(){char(*pFun)(int);pFun = Fun;char c = (*pFun)(83);cout << c;}
二、函数指针——typedef形式
char Fun(int n) { return char(n); }//typedef char(*PFun)(int);//PFun pFun;void main(){typedef char(*PFun)(int);PFun pFun;pFun = Fun;char c = (*pFun)(83);cout << c;}
三、类成员函数指针
class Base{public:char Fun(int n) { return char(n); }};//typedef char (Base::*PFun)(int);//PFun pFun;void main(){typedef char (Base::*PFun)(int);PFun pFun;pFun = &Base::Fun;Base instance;char c = (instance.*pFun)(83);cout << c;}
四、类成员函数指针——类指针
class Base{public:char Fun(int n) { return char(n); }};//typedef char (Base::*PFun)(int);//PFun pFun;void main(){typedef char (Base::*PFun)(int);PFun pFun;pFun = &Base::Fun;Base *pInstance = new Base();char c = (pInstance->*pFun)(83);delete pInstance;cout << c;}
五、类成员函数指针——内部调用(this->*)
class Base{public:char Fun(int n) { return char(n); }char Fun2(){char (Base::*pFun)(int);pFun = &Base::Fun;char c = (this->*pFun)(83);return c;}};void main(){Base instance;char c = instance.Fun2();cout << c;}
六、类成员函数指针——继承调用
class Base{public:char Fun(int n) { return char(n); }char Fun2(int n){//char (Base::*pFun)(int);//pFun = &Base::Fun;typedef char (Base::*PFun)(int);PFun pFun = &Base::Fun;return Proc(n, pFun);}char Proc(int n, char(Base::*pFun)(int)){return (this->*pFun)(n);}};class Derive : Base{public:char Fun(int n) { return char(n - 1); }char Fun2(int n){typedef char (Base::*PFun)(int);PFun pFun = static_cast<PFun>(&Derive::Fun);return Proc(n, pFun);}};void main(){Base base;char bc = base.Fun2(83);cout << bc;Derive derive;char dc = derive.Fun2(83);cout << dc;}
七、类成员函数指针——虚拟函数
class Base{public:void OFun() { cout << "base ordinary" << endl; }virtual void VFun(int i) { cout << "base virtual" << endl; }};class Derive : public Base{public:void OFun() { cout << "derive ordinary" << endl; }virtual void VFun(int i) { cout << "derive virtual" << endl; }};void main(){typedef void (Base::*BaseOFun)();typedef void (Derive::*DeriveOFun)();BaseOFun baseOFun = &Base::OFun;DeriveOFun deriveOFun = static_cast<DeriveOFun>(baseOFun);typedef void (Base::*BaseVFun)(int);typedef void (Derive::*DeriveVFun)(int);BaseVFun baseVFun = &Base::VFun;DeriveVFun deriveFVun = static_cast<DeriveVFun>(baseVFun);Base base;(base.*baseOFun)();(base.*baseVFun)(1);Derive derive;(derive.*deriveOFun)();(derive.*deriveFVun)(1);}
