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std::thread::joinable(3) C++ Standard Libary std::thread::joinable(3) NAME std::thread::joinable - std::thread::joinable Synopsis bool joinable() const noexcept; (since C++11) Checks if the std::thread object identifies an active thread of exe- cution. Specifically, returns true if get_id() != std::thread::id(). So a default constructed thread is not joinable. A thread that has finished executing code, but has not yet been joined is still considered an active thread of execution and is therefore joinable. Parameters (none) Return value true if the thread object identifies an active thread of execution, false otherwise Example // Run this code #include <iostream> #include <thread> #include <chrono> void foo() { std::this_thread::sleep_for(std::chrono::seconds(1)); } int main() { std::thread t; std::cout << "before starting, joinable: " << std::boolalpha << t.joinable() << '\n'; t = std::thread(foo); std::cout << "after starting, joinable: " << t.joinable() << '\n'; t.join(); std::cout << "after joining, joinable: " << t.joinable() << '\n'; } Output: before starting, joinable: false after starting, joinable: true after joining, joinable: false References * C++20 standard (ISO/IEC 14882:2020): * 32.4.2.5 Members [thread.thread.member] * C++17 standard (ISO/IEC 14882:2017): * 33.3.2.5 thread members [thread.thread.member] * C++14 standard (ISO/IEC 14882:2014): * 30.3.1.5 thread members [thread.thread.member] * C++11 standard (ISO/IEC 14882:2011): * 30.3.1.5 thread members [thread.thread.member] See also get_id returns the id of the thread (public member function) join waits for the thread to finish its execution (public member function) detach permits the thread to execute independently from the thread handle (public member function) http://cppreference.com 2022.07.31 std::thread::joinable(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | References | See also
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