创建 stdthread

在 C++中，使用 std::thread 类创建线程。线程是一个单独的执行流程; 它类似于让你的帮助者在你同时执行另一个任务时执行一项任务。当线程中的所有代码都被执行时，它就会终止。创建线程时，需要传递要在其上执行的内容。你可以传递给线程的一些事情：

• 免费功能
• 会员职能
• Functor 对象
• Lambda 表达式

自由函数示例 - 在单独的线程上执行函数（ 实例 ）：

#include <iostream>
#include <thread>
 
void foo(int a)
{
    std::cout << a << '\n';
}
 
int main()
{
    // Create and execute the thread
    std::thread thread(foo, 10); // foo is the function to execute, 10 is the
                                 // argument to pass to it
 
    // Keep going; the thread is executed separately
 
    // Wait for the thread to finish; we stay here until it is done
    thread.join();
 
    return 0;
}

成员函数示例 - 在单独的线程上执行成员函数（ 实例 ）：

#include <iostream>
#include <thread>
 
class Bar
{
public:
    void foo(int a)
    {
        std::cout << a << '\n';
    }
};
 
int main()
{
    Bar bar;
    
    // Create and execute the thread
    std::thread thread(&Bar::foo, &bar, 10); // Pass 10 to member function
 
    // The member function will be executed in a separate thread
 
    // Wait for the thread to finish, this is a blocking operation
    thread.join();
 
    return 0;
}

Functor 对象示例（ 实例 ）：

#include <iostream>
#include <thread>
 
class Bar
{
public:
    void operator()(int a)
    {
        std::cout << a << '\n';
    }
};
 
int main()
{
    Bar bar;
    
    // Create and execute the thread
    std::thread thread(bar, 10); // Pass 10 to functor object
 
    // The functor object will be executed in a separate thread
 
    // Wait for the thread to finish, this is a blocking operation
    thread.join();
 
    return 0;
}

Lambda 表达式示例（ 实例 ）：

#include <iostream>
#include <thread>
 
int main()
{
    auto lambda = [](int a) { std::cout << a << '\n'; };

    // Create and execute the thread
    std::thread thread(lambda, 10); // Pass 10 to the lambda expression
 
    // The lambda expression will be executed in a separate thread
 
    // Wait for the thread to finish, this is a blocking operation
    thread.join();
 
    return 0;
}