C++ std::async()函数的使用_std::async怎么调用对象的函数

/**
* @author jsq
* @date 20210613
* @function: 学习std::future模板类、std::async()、std::packaged_task()模板类、std::promise()模板类的使用
* @notice:
*/
#include <iostream>
#include <thread>
#include <vector>
#include <list>
#include <mutex>
#include <future>
using namespace std;
 
class A {
 
public:
	
	int APrint(int para) {
 
		cout << "用对象成员函数创建的线程开始执行!" << endl;
		std::chrono::milliseconds dura(2000);
		std::this_thread::sleep_for(dura);
		cout << "children thread id:" << std::this_thread::get_id() << endl;
		cout << "para is:" << para << endl;
		cout << "用对象成员函数创建的线程执行完毕!" << endl;
 
		return 666;
	}
};
 
 
int myprint() {
 
	cout << "子线程开始执行!" << endl;
	
	std::chrono::milliseconds dura(5000);
	std::this_thread::sleep_for(dura);
	cout << "current thread id:" << std::this_thread::get_id() &l