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    std::is_error_code_enum<std::future_errc>

    From cppreference.com
     
    C++
     
    Concurrency support library
    Threads
    (C++11)
    (C++20)
    (C++17)(C++17)
    this_thread namespace
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    Cooperative cancellation
    Mutual exclusion
    (C++11)
    (C++11)
    (C++17)
    Generic lock management
    (C++11)
    (C++11)
    (C++17)
    (C++11)
    (C++14)
    (C++11)
    (C++11)
    (C++11)
    (C++11)(C++11)(C++11)(C++11)(C++11)(C++11)
    Condition variables
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    Semaphores
    (C++20)(C++20)
    Latches and Barriers
    (C++20)
    (C++20)
    Futures
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    (C++11)
    Safe Reclamation