operator==,!=,<,<=,>,>=,<=>(std::thread::id)
From cppreference.com
| Defined in header <thread>
|
||
bool operator==( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(1) | (since C++11) |
bool operator!=( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(2) | (since C++11) (until C++20) |
bool operator< ( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(3) | (since C++11) (until C++20) |
bool operator<=( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(4) | (since C++11) (until C++20) |
bool operator> ( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(5) | (since C++11) (until C++20) |
bool operator>=( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(6) | (since C++11) (until C++20) |
std::strong_ordering operator<=>( std::thread::id lhs, std::thread::id rhs ) noexcept; |
(7) | (since C++20) |
Compares two thread identifiers.
1,2) Checks whether
lhs and rhs represent either the same thread, or no thread.3-7) Compares
lhs and rhs in an unspecified total ordering.|
The |
(since C++20) |
Parameters
| lhs, rhs | - | thread identifiers to compare |
Return value
1-6)
true if the corresponding relation holds, false otherwise.7)
std::strong_ordering::less if lhs is less than rhs in the total ordering; otherwise std::strong_ordering::greater if rhs is less than lhs in the total ordering; otherwise std::strong_ordering::equal.Complexity
Constant.
Example
Run this code
#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();
}
Possible output:
id1 > id2
id1: 139741717640896
id2: 139741709248192
See also
C documentation for thrd_equal
|