编辑“︁C++ 线程标识”︁（章节）

== 线程标识的比较与哈希 ==  
<code>std::thread::id</code>支持比较和哈希操作，适用于条件分支和容器存储：  
<syntaxhighlight lang="cpp">  
#include <iostream>  
#include <thread>  
#include <unordered_set>  

int main() {  
    std::thread::id main_id = std::this_thread::get_id();  
    std::thread t([]{});  
    std::thread::id child_id = t.get_id();  

    std::cout << "Is main thread? " << (main_id == std::this_thread::get_id()) << '\n';  
    std::cout << "Is child thread? " << (child_id == std::this_thread::get_id()) << '\n';  

    std::unordered_set<std::thread::id> id_set;  
    id_set.insert(main_id);  
    id_set.insert(child_id);  
    std::cout << "Unique IDs stored: " << id_set.size() << '\n';  

    t.join();  
}  
</syntaxhighlight>  
'''输出示例'''：  
<pre>  
Is main thread? 1  
Is child thread? 0  
Unique IDs stored: 2  
</pre>