std::copy_constructible

Since C++20

Header: <concepts>

The concept copy_constructible is satisfied if T is an lvalue reference 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).

# Declarations

template< class T >
concept copy_constructible =
std::move_constructible<T> &&
std::constructible_from<T, T&> && std::convertible_to<T&, T> &&
std::constructible_from<T, const T&> && std::convertible_to<const T&, T> &&
std::constructible_from<T, const T> && std::convertible_to<const T, T>;

(since C++20)

# See also