c – 在成员函数上启动线程时发出不需要的析构函数

我的main函数中有一个事件循环,我想创建一个对象并在对象的成员函数上运行一个线程.但是,我注意到在线程启动之前对象被销毁了.我不明白为什么.

我的代码：

#include <iostream>
#include <thread>

class MyClass {
public:
    MyClass(){
        std::cout << "MyClass constructor is called" << std::endl;
    }
    ~MyClass(){
        std::cout << "MyClass destructor is called" << std::endl;
    }    
    void start(){
        std::cout << "MyClass is starting" << std::endl;
    }
};

int main()
{
        MyClass mine;
        std::thread t(&MyClass::start,mine);
        t.join();
}

输出：

MyClass constructor is called
MyClass destructor is called
MyClass is starting
MyClass destructor is called
MyClass destructor is called

期望的输出：

MyClass constructor is called
MyClass is starting
MyClass destructor is called

解决方法

通过引用传递我的：std :: thread t(& MyClass :: start,std :: ref(mine));
我的类型是MyClass,这意味着你按值传递它.所以std :: thread将它的副本传递给新创建的线程.

你需要通过引用明确地告诉你通过我的模板.