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

(1.1)
After the definition T u = rv;, u is equal to u2.
(1.2)
T(rv) is equal to u2.
(1.3)
If T is not const, rv's resulting state is valid but unspecified ([lib.types.movedfrom]); otherwise, it is unchanged.