std::atomic::atomic(3) C++ Standard Libary std::atomic::atomic(3) NAME std::atomic::atomic - std::atomic::atomic Synopsis (since atomic() noexcept = default; C++11) (un- til C++20) constexpr atomic() (1) (since noexcept(std::is_nothrow_default_constructible_v<T>); C++20) constexpr atomic( T desired ) noexcept; (2) (since C++11) atomic( const atomic& ) = delete; (3) (since C++11) Constructs a new atomic variable. 1) The default constructor is trivial: no initialization takes place other than zero initialization of static and thread-local objects. (until C++20) std::atomic_init may be used to complete initialization. 1) Value-initializes the underlying object (i.e. with T()). The initialization is not atomic. (since C++20) The program is ill-formed if std::is_default_constructible_v<T> is false. 2) Initializes the underlying object with desired. The initialization is not atomic. 3) Atomic variables are not CopyConstructible. Parameters desired - value to initialize with Notes The default-initialized std::atomic<T> does not contain a T object, and its only valid uses are destruction and initialization by (until C++20) std::atomic_init, see LWG issue 2334. http://cppreference.com 2024.06.10 std::atomic::atomic(3)
NAME | Synopsis | Parameters | Notes
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