一、传递类对象作为线程参数

#include<iostream>
#include<thread>using namespace std;class A
{
public:mutable int m_i;//类型转换构造函数，可以把一个int转换成一个类A对象A(int a) :m_i(a) {cout << "[A::A(int a)构造函数执行]" << this << "thread_id = " << std::this_thread::get_id() << endl;}A(const A& a) :m_i(a.m_i) {cout << "[A::A(int a)拷贝构造函数执行]" << this << "thread_id = " << std::this_thread::get_id() << endl;}~A() {cout << "[A::~A(int a)析构函数执行]" << this << "thread_id = " << std::this_thread::get_id() << endl;}
};void myprint2(const A& pmybuf)
{pmybuf.m_i = 199; // 因为是mutable的，修改该值不会影响main函数cout << "子线程myprint2的参数地址是" << &pmybuf << "thread_id = " << std::this_thread::get_id() << endl;// 打