operator==,!=,<,<=,>,>=,<=>(std::thread::id)
来自cppreference.com
| 在标头 <thread> 定义
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bool operator==( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(1) | (C++11 起) |
bool operator!=( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(2) | (C++11 起) (C++20 前) |
bool operator< ( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(3) | (C++11 起) (C++20 前) |
bool operator<=( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(4) | (C++11 起) (C++20 前) |
bool operator> ( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(5) | (C++11 起) (C++20 前) |
bool operator>=( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(6) | (C++11 起) (C++20 前) |
std::strong_ordering operator<=>( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(7) | (C++20 起) |
比较两个线程标识符。
1,2) 检查
lhs 与 rhs 是否表示同一线程或均不表示线程。3-7) 在未指明的全序中比较
lhs 与 rhs。|
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(C++20 起) |
参数
| lhs, rhs | - | 要比较的线程标识符 |
返回值
1-6) 若相应的关系成立则为
true，否则为 false。7) 若在该全序中
lhs 小于 rhs 则为 std::strong_ordering::less；否则若在该全序中 rhs 小于 lhs 则为 std::strong_ordering::greater ；否则为 std::strong_ordering::equal。复杂度
常数。
示例
运行此代码
#include <cassert>
#include <chrono>
#include <iostream>
#include <thread>
int main()
{
auto work = [] { std::this_thread::sleep_for(std::chrono::seconds(1)); };
std::thread t1(work);
std::thread t2(work);
assert(t1.get_id() == t1.get_id() and
t2.get_id() == t2.get_id() and
t1.get_id() != t2.get_id());
if (const auto cmp = t1.get_id() <=> t2.get_id(); cmp < 0)
std::cout << "id1 < id2\n";
else
std::cout << "id1 > id2\n";
std::cout << "id1: " << t1.get_id() << "\n"
"id2: " << t2.get_id() << '\n';
t1.join();
t2.join();
}
可能的输出：
id1 > id2
id1: 139741717640896
id2: 139741709248192
参阅
thrd_equal 的 C 文档
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