std::hash<std::thread::id>

`<thread>`
`template<> struct hash<std::thread::id>;`		( C++11)

std::hash std::thread::id .

#include <iostream>
#include <thread>
#include <chrono>
#include <vector>
using namespace std::chrono_literals;
void foo()
{
    std::this_thread::sleep_for(10ms);
}
 
int main()
{
    std::vector<std::thread> v;
    for(int n = 0; n < 4; ++n)
        v.emplace_back(foo);

    std::hash<std::thread::id> hasher;
    for(auto& t : v) {
        std::cout << " " << t.get_id() << "   " << hasher(t.get_id()) << '\n';
        t.join();
    }
}

:

 139786440144640   8905351942358389397
 139786431751936   9222844670065909738
 139786423359232   18199000599186780501
 139786414966528   15386662774029264672

hash

(C++11)

-
( ) []

-
thread::id
-
thread::thread
thread::~thread
thread::operator=

thread::joinable
thread::get_id
thread::native_handle
thread::hardware_concurrency

thread::join
thread::detach
thread::swap
,
std::swap(std::thread)

-
id::id
,
operator==operator!=operator<operator<=operator>operator>=operator<=> ( C++20)( C++20)( C++20)( C++20)( C++20)(C++20)
operator<<

std::hash<std::thread::id>
std::formatter<std::thread::id> (C++23)







(C++20)

(C++20)
(C++11)





(C++20)


/

(C++11)
(C++11)
(C++11)
(C++17)

cppreference.com

std::hash<std::thread::id>