std::default_initializable(3) C++ Standard Libary std::default_initializable(3) NAME std::default_initializable - std::default_initializable Synopsis Defined in header <concepts> template< class T > concept default_initializable = std::constructible_from<T> && (since C++20) requires { T{}; } && /* T t; is well-formed, see below */; The default_initializable concept checks whether variables of type T can be * value-initialized (T() is well-formed); * direct-list-initialized from an empty initializer list (T{} is well- formed); and * default-initialized (T t; is well-formed). Access checking is performed as if in a context unrelated to T. Only the validity of the immediate context of the variable initialization is considered. Possible implementation template<class T> concept default_initializable = std::constructible_from<T> && requires { T{}; } && requires { ::new T; }; See also specifies that a variable of the type can be constructible_from constructed from or bound to a set of argument (C++20) types (concept) is_default_constructible is_trivially_default_constructible is_nothrow_default_constructible checks if a type has a default con- structor (C++11) (class template) (C++11) (C++11) http://cppreference.com 2024.06.10 std::default_initializable(3)
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