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

STD：：散列<std：：线程：：id>

Defined in header ​​
template<> struct hash<std::thread::id>;​(since C++11)

模板的专门化std::hash为std::thread::id类允许用户获取线程标识符的散列。

例

二次

#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 << "thread " << t.get_id() << " hashes to " << hasher(t.get_id()) << '\n';
        t.join(
    }
}

二次

可能的产出：

二次

thread 139786440144640 hashes to 8905351942358389397
thread 139786431751936 hashes to 9222844670065909738
thread 139786423359232 hashes to 18199000599186780501
thread 139786414966528 hashes to 15386662774029264672

二次

另见

hash (C++11)hash function object (class template)

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