std::move_constructible

 

C++

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Named requirements

Feature test macros (C++20)

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Concepts library (C++20)

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External libraries

 

Concepts library

Core language concepts same_as (C++20) derived_from (C++20) convertible_to (C++20) common_reference_with (C++20) common_with (C++20) integral (C++20) signed_integral (C++20) unsigned_integral (C++20) floating_point (C++20) swappableswappable_with (C++20)(C++20) destructible (C++20) constructible_from (C++20) default_initializable (C++20)   move_constructible (C++20) copy_constructible (C++20) assignable_from (C++20)

Comparison concepts equality_comparableequality_comparable_with (C++20)(C++20) totally_orderedtotally_ordered_with (C++20)(C++20) Object concepts movable (C++20) copyable (C++20) semiregular (C++20) regular (C++20) Callable concepts invocableregular_invocable (C++20)(C++20) predicate (C++20) relation (C++20) equivalence_relation (C++20) strict_weak_order (C++20)

Exposition-only concepts boolean-testable  (C++20)

 

Defined in header <concepts>
template< class T > concept move_constructible = std::constructible_from<T, T> && std::convertible_to<T, T>;		(since C++20)

The concept move_constructible is satisfied if T is a reference type, or if it is an object type where an object of that type can be constructed from an rvalue of that type in both direct- and copy-initialization contexts, with the usual semantics.

Semantic requirements

If T is an object type, then move_constructible<T> is modeled only if given

• rv, an rvalue of type T, and
• u2, a distinct object of type T equal to rv,

the following are true:

• After the definition T u = rv;, u is equal to u2;
• T(rv) is equal to u2; and
• If T is not const-qualified, then rv's resulting state (after the definition/expression is evaluated in either bullets above) is valid but unspecified; otherwise, it is unchanged.

References

• C++23 standard (ISO/IEC 14882:2024):

• 18.4.13 Concept move_constructible [concept.moveconstructible]

• C++20 standard (ISO/IEC 14882:2020):

• 18.4.13 Concept move_constructible [concept.moveconstructible]

See also

is_move_constructibleis_trivially_move_constructibleis_nothrow_move_constructible (C++11)(C++11)(C++11)

checks if a type can be constructed from an rvalue reference (class template)

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