c++ - 类方法作为函数参数

Question

我正在尝试将某些类方法传递给某些函数并出现“函数调用缺少参数列表；使用‘&’创建指向成员的指针”错误。

//There is some class
class A {
  int someField;
  void Add(int someAdd) {
    someField += someAdd;
  }
}

//And function
void someFunc(std::function<void(int x)> handler) {
  //Some code
  handler(234);
}

//Class method pass to function
void main() {
  A* instanceA = new A();
  someFunc(instanceA->Add); //Error 19  error C3867: 'A::Add': function call missing argument list; use '&A::Add' to create a pointer to member
}

怎么了？

Answer 1

C++ 没有作为语言构造的绑定(bind)方法。写:

someFunc(std::bind(&A::Add, instanceA, std::placeholders::_1));