C++中的 ->* 和 .* 操作符

原创于 2019-02-26 20:41:52 发布 · 4.1k 阅读

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本文详细介绍了C++中如何使用成员函数指针，包括如何定义、赋值及通过对象或指向对象的指针来调用。展示了使用.*和->*运算符来调用指向类成员的函数指针的具体方法。

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//we have a class
struct X
{
   void f() {}
   void g() {}
};

typedef void (X::*pointer)();
//ok, let's take a pointer and assign f to it.
pointer somePointer = &X::f;
//now I want to call somePointer. But for that, I need an object
X x;
//now I call the member function on x like this
(x.*somePointer)(); //will call x.f()
//now, suppose x is not an object but a pointer to object
X* px = new X;
//I want to call the memfun pointer on px. I use ->*
(px ->* somePointer)(); //will call px->f();

我的理解，->* 和 .* 用来调用指向类成员的函数指针。

上面的代码出处：https://stackoverflow.com/questions/6586205/what-are-the-pointer-to-member-and-operators-in-c