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std::copy_constructible(3) C++ Standard Libary std::copy_constructible(3) NAME std::copy_constructible - std::copy_constructible Synopsis Defined in header <concepts> template <class T> concept copy_constructible = std::move_constructible<T> && std::constructible_from<T, T&> && std::convertible_to<T&, T> && (since C++20) std::constructible_from<T, const T&> && std::convertible_to<const T&, T> && std::constructible_from<T, const T> && std::convertible_to<const T, T>; The concept copy_constructible is satisfied if T is an lvalue refer- ence type, or if it is a move_constructible object type where an object of that type can constructed from a (possibly const) lvalue or const rvalue of that type in both direct- and copy-initialization contexts with the usual semantics (a copy is constructed with the source unchanged). Semantic requirements If T is an object type, then copy_constructible<T> is modeled only if given * v, a lvalue of type (possibly const) T or an rvalue of type const T, the following are true: * After the definition T u = v;, u is equal to v and v is not mod- ified; * T(v) is equal to v and does not modify v. See also is_copy_constructible is_trivially_copy_constructible is_nothrow_copy_constructible checks if a type has a copy con- structor (C++11) (class template) (C++11) (C++11) http://cppreference.com 2022.07.31 std::copy_constructible(3)
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