pointer to function and pointer to member function

<essential c++>的确很好，不过功力未足，看至后面便云里雾里了。

#include<iostream>
#include<vector>

usingnamespacestd;

classF
...{
public:
F()...{}
stringfunctionA(stringa)
...{
cout<<"itisA"<<endl;
returna;
}
stringfuncionB(stringb)
...{
cout<<"itisB"<<endl;
returnb;
}

};

intadd(inta,intb)
...{
returna+b;
}

intsub(inta,intb)
...{
returna-b;
}

int_tmain(intargc,_TCHAR*argv[])
...{
/**//*pointertomemberfunction*/
Ff;
string(F::*p)(stringa);
p=&F::functionA;
(f.*p)("a");
p=&F::funcionB;
(f.*p)("b");


/**//*poinertofunction*/
int(*q)(inta,intb);
q=&add;
cout<<(*q)(1,2)<<endl;
q=&sub;
cout<<(*q)(1,2)<<endl;


return0;
}