C++使用std::bind結合使用進行回調.

參數

參數類型不應該是具體類型,而是std::function類型.

代碼

#include<string>
#include<iostream>
#include<functional>

using ExampleFunction = std::function<void(const char*)>;

class Object {
public:
   void hello(const std::string& s)
   {
       std::cout << "Hello " << s << '\n';
   }
   void hello(const char*s)
   {
       std::cout << "Hello " << s << '\n';
   }
   void call(ExampleFunction func)
   {
       func("in call");
   }
};

int main()
{
   Object instance;
   std::string str("World");
   ExampleFunction f = std::bind((void(Object::*)(const char*))&Object::hello, &instance, 
                                 std::placeholders::_1);
   f("hello");
   instance.call(f);
}