18 Concepts library [concepts]

18.4 Language-related concepts [concepts.lang]

18.4.13 Concept move_­constructible [concept.moveconstructible]

template<class T> concept move_­constructible = constructible_from<T, T> && convertible_to<T, T>;
If T is an object type, then let rv be an rvalue of type T and u2 a distinct object of type T equal to rv.
T models move_­constructible only if
  • After the definition T u = rv;, u is equal to u2.
  • T(rv) is equal to u2.
  • If T is not const, rv's resulting state is valid but unspecified ([lib.types.movedfrom]); otherwise, it is unchanged.