C++回调函数

#ifndef __CALL_BACK_DEFINE_H__
#define __CALL_BACK_DEFINE_H__
#include <iostream>
using namespace std;

// STEP1: 声明回调函数类型
typedef void (*call_back_test1)(int para1, int para2);

typedef int (*call_back_test2)(int para1, int para2);

// STEP2: 定义具体回调函数
static void call_back_testA1(int para1, int para2)
{
    cout << "call_back_test1:" << para1 << ", " << para2 << endl;
}

static int call_back_testA2(int para1, int para2)
{
    cout << "call_back_test2:" << para1 << ", " << para2 << ", result:" << para1 + para2 << endl;
    return para1 + para2;
}

#endif

#include <iostream>
#include "callbackDefine.h"

// STEP3: 回调函数 作为 普通函数的 参数
void printTestA1(call_back_test1 call)
{
    std::cout << "This is printTestA1" << std::endl;
    call(1,2);
}
void printTestA2(call_back_test2 call)
{
    std::cout << "This is printTestA2" << std::endl;
    call(3,4);
}
void printTestA3(void (*call_back_testA3)(int para1, int para2))
{
    std::cout << "This is printTestA3" << std::endl;
    call_back_testA3(3,4);
}

#include <iostream>
#include "test2.h"
#include "callbackDefine.h"
using namespace std;
int main()
{
    printTestA1(call_back_testA1);
    printTestA2(call_back_testA2);
    // call_back_test1 call3 = [](int x, int y) {
    //     cout << "printTestA3: x:" << x << ", y:" << y << endl;
    // };
    auto call3 = [](int x, int y) {
        cout << "printTestA3: x:" << x << ", y:" << y << endl;
    };
  //  call3(4,5);
    printTestA3(call3);
    cout << "Hello world ! " << endl;
    return 0;
}