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 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).
   Semantic requirements
   If T is an object type, then copy_constructible<T> is modeled only if given
     * v, an 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 modified;
     * 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 constructor
   (C++11) (class template)
   (C++11)
   (C++11)