编辑“︁C++ 线程标识”︁（章节）

== 线程标识的实际应用 ==  

=== 调试与日志 ===  
在多线程程序中，通过标识区分日志来源：  
<syntaxhighlight lang="cpp">  
#include <iostream>  
#include <thread>  
#include <vector>  

void worker(int id) {  
    std::cout << "Thread " << id << " (ID: " << std::this_thread::get_id() << ") working\n";  
}  

int main() {  
    std::vector<std::thread> threads;  
    for (int i = 0; i < 3; ++i) {  
        threads.emplace_back(worker, i);  
    }  
    for (auto& t : threads) {  
        t.join();  
    }  
}  
</syntaxhighlight>  
'''输出示例'''：  
<pre>  
Thread 0 (ID: 140737337628416) working  
Thread 1 (ID: 140737329235712) working  
Thread 2 (ID: 140737320843008) working  
</pre>  

=== 线程特定存储 ===  
结合<code>std::unordered_map</code>实现线程本地数据管理：  
<syntaxhighlight lang="cpp">  
#include <iostream>  
#include <thread>  
#include <unordered_map>  
#include <mutex>  

std::unordered_map<std::thread::id, int> thread_data;  
std::mutex mtx;  

void add_data(int value) {  
    std::lock_guard<std::mutex> lock(mtx);  
    thread_data[std::this_thread::get_id()] = value;  
}  

int main() {  
    std::thread t1(add_data, 10), t2(add_data, 20);  
    t1.join();  
    t2.join();  

    for (const auto& pair : thread_data) {  
        std::cout << "Thread " << pair.first << ": " << pair.second << '\n';  
    }  
}  
</syntaxhighlight>  
'''输出示例'''：  
<pre>  
Thread 140737329235712: 20  
Thread 140737337628416: 10  
</pre>