Defined in header <thread> | ||
---|---|---|
template<> struct hash<std::thread::id>; | (since C++11) |
The template specialization of std::hash
for the std::thread::id
class allows users to obtain hashes of the identifiers of threads.
Example
#include <iostream> #include <thread> #include <chrono> #include <vector> using namespace std::literals::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(); } }
Possible output:
thread 139786440144640 hashes to 8905351942358389397 thread 139786431751936 hashes to 9222844670065909738 thread 139786423359232 hashes to 18199000599186780501 thread 139786414966528 hashes to 15386662774029264672
See also
(C++11) | hash function object (class template) |
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