#include <iostream>
#include <functional>
class Base
{
public:
virtual ~Base() {}
virtual void f1() const {std::cout<<"Base::f1() called"<<std::endl;}
virtual void f1(int) const {std::cout<<"Base::f1(int) called"<<std::endl;}
virtual void f2() const {std::cout<<"Base::f2() called"<<std::endl;}
};
class Derived : public Base
{
public:
virtual ~Derived() {}
void f1() const {std::cout<<"Derived::f1() called"<<std::endl;}
};
int main()
{
Base base;
Derived derived;
auto func1 = std::bind(static_cast<void(Base::*)()const>(&Base::f1), std::cref(base));
func1();
auto func2 = std::bind(static_cast<void(Derived::*)()const>(&Derived::f1), std::cref(derived));
func2();
auto func3 = std::bind(&Base::f2, std::cref(base));
func3();
auto func4 = std::bind(&Derived::f2, std::cref(derived));
func4();
auto func5 = std::bind(static_cast<void(Base::*)(int)const>(&Base::f1), std::cref(base), std::placeholders::_1);
func5(1);
auto func6 = std::bind(static_cast<void(Derived::*)(int)const>(&Derived::f1), std::cref(derived), std::placeholders::_1); // error line
func6(2);
return 0;
}
当我尝试构建上面的代码时,gcc提供了以下错误消息。std :: bind从父类的重载函数
test.cpp:34:80: error: invalid static_cast from type ‘void (Derived::)() const’ to type ‘void (Derived::)(int) const’
auto func6 = std::bind(static_cast(&Derived::f1), std::cref(derived), std::placeholders::_1);
我不知道是否有与我可以通过Derived
类绑定Base::f1(int)
任何方法(绑定func6
在这里成功)。 任何帮助表示赞赏。
你是否想把'Derived :: f1'标记为'override'? – Tas
@Tas你不需要写'override'。如果在基类中存在具有相同签名的虚拟函数,它将隐含地覆盖它。只有*肯定*你会覆写你写的'override'。 – Rakete1111
在'Derived'中添加'使用Base :: f1;'将会起作用。可能的重复[C++问题与继承类中的函数重载](http://stackoverflow.com/questions/14212190/c-issue-with-function-overloading-in-an-inherited-class) – neuront