std::this_thread::get_id()
头文件：<thread>
函数：std::this_thread::get_id()
用例：std::thread::id thread_id = std::this_thread::get_id();
std::thread对象的成员函数get_id()
头文件：<thread>
函数：std::thread::id get_id()
用例:通过调用std::thread对象的成员函数get_id()来直接获取
#include <thread>
std::thread t;
t.get_id();