std::is_move_assignable,std::is_trivially_move_assignable,std::is_nothrow_move_assignable (3) - Linux Manuals
std::is_move_assignable,std::is_trivially_move_assignable,std::is_nothrow_move_assignable: std::is_move_assignable,std::is_trivially_move_assignable,std::is_nothrow_move_assignable
NAME
std::is_move_assignable,std::is_trivially_move_assignable,std::is_nothrow_move_assignable - std::is_move_assignable,std::is_trivially_move_assignable,std::is_nothrow_move_assignable
Synopsis
Defined in header <type_traits>
template< class T > (1) (since C++11)
struct is_move_assignable;
template< class T > (2) (since C++11)
struct is_trivially_move_assignable;
template< class T > (3) (since C++11)
struct is_nothrow_move_assignable;
1) If T is not a referenceable type (i.e., possibly cv-qualified void or a function type with a cv-qualifier-seq or a ref-qualifier), provides a member constant value equal to false. Otherwise, provides a member constant value equal to std::is_assignable<T&, T&&>::value.
2) Same as 1), but uses std::is_trivially_assignable<T&, T&&>
3) Same as 1), but uses std::is_nothrow_assignable<T&, T&&>
T shall be a complete type, (possibly cv-qualified) void, or an array of unknown bound. Otherwise, the behavior is undefined.
If an instantiation of a template above depends, directly or indirectly, on an incomplete type, and that instantiation could yield a different result if that type were hypothetically completed, the behavior is undefined.
Helper variable templates
template< class T > (since C++17)
inline constexpr bool is_move_assignable_v = is_move_assignable<T>::value;
template< class T > (since C++17)
inline constexpr bool is_trivially_move_assignable_v = is_trivially_move_assignable<T>::value;
template< class T > (since C++17)
inline constexpr bool is_nothrow_move_assignable_v = is_nothrow_move_assignable<T>::value;
Inherited from std::integral_constant
Member constants
value true if T is move-assignable, false otherwise
[static]
Member functions
operator bool (public member function)
operator() returns value
(C++14)
Member types
Type Definition
value_type bool
type std::integral_constant<bool, value>
Possible implementation
Notes
The trait std::is_move_assignable is less strict than MoveAssignable because it does not check the type of the result of the assignment (which, for a MoveAssignable type, must be T&), nor the semantic requirement that the target's value after the assignment is equivalent to the source's value before the assignment.
The type does not have to implement a move_assignment_operator in order to satisfy this trait; see MoveAssignable for details.
Example
// Run this code