class Child;
class Parent
{
public:
void (*funcPointer)();
void (*funcPointer2)(Parent* _this);
void (Child::*funcPointer3)();
};
class Child: public Parent
{
public:
void TestFunc(){
}
void Do(){
Parent p;
p.funcPointer=TestFunc; // error,'=': cannot convert from 'void (__thiscall Child::* )(void)' to 'void (__cdecl *)(void)'
p.funcPointer2=TestFunc; // error too,'=': cannot convert from 'void (__thiscall Child::* )(void)' to 'void (__cdecl *)(Parent *)'
p.funcPointer3=TestFunc; //this works
p.funcPointer3=&Child::TestFunc; // this works too.
p.funcPointer3(); // error,term does not evaluate to a function taking 0 arguments
}
};
解决方法
你不行您或者传递一个指向静态方法的指针,或者父级也必须接受一个指向该对象的指针.
你可能想看看boost::bind和boost::function：
#include <boost/bind.hpp>
#include <boost/function.hpp>
struct Y
{
void say(void) { std::cout << "hallo!";}
boost::function<void()> getFunc() { return boost::bind(&Y::say,this); }
};
struct X
{
//non-boost:
void (Y::*func)();
Y* objectY;
void callFunc() { (objectY->*func)(); }
//boost version:
boost::function<void()> f;
};
X x;
Y y;
x.f = boost::bind(&Y::say,boost::ref(y));
x.f = y.getFunc();
x.f();
x.func = &Y::say;
x.objectY = &y;
x.callFunc();
