一.函数指针

#include <iostream>typedef void (*callback)(int ,int);
class MyTest
{
public:void setCallback(callback cb){m_callback = cb;}void add(int a, int b){m_callback(a, b);}private:callback m_callback;
};void onCallback(int a, int b)
{std::cout << "a + b = " << a + b << std::endl;
}int main(int argc, char *argv[])
{MyTest test;test.setCallback(onCallback);test.add(1, 1);return 0;
}

二.std::bind和std::function

#include <functional>
#include <iostream>typedef std::function<void (int ,int)> callback;
class MyTest
{
public:void setCallback(callback cb){m_callback = cb;}void add(int a, int b){m_callback(a, b