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std::is_move_assignable, std::is_trivially_move_assignable, std::is_nothrow_move_assignable

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Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
Gestión de errores
Programa de servicios públicos
Funciones variadic
Fecha y hora
Objetos Function
(C++11)
Operadores relacionales
Original:
Relational operators
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Pares y tuplas
Original:
Pairs and tuples
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Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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Tipos básicos
Original:
Basic types
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Tipos fundamentales
Tipos fijos ancho enteros (C++11)
Límites numéricos
Original:
Numeric limits
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C numérico limita interfaz
Información de tipo en tiempo de ejecución
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Runtime type information
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Caracteres de tipo
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Type traits
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Categorías primarias de tipo
Original:
Primary type categories
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Propiedades de tipo
Original:
Type properties
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Operaciones compatibles
Original:
Supported operations
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is_move_assignableis_trivially_move_assignableis_nothrow_move_assignable
(C++11)(C++11)(C++11)
Relaciones y consultas de propiedad
Original:
Relationships and property queries
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Modificaciones de tipo
Original:
Type modifications
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Transformaciones de tipo
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Type transformations
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Escriba constantes rasgos
Original:
Type trait constants
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Definido en la cabecera <type_traits>
template< class T >
struct is_move_assignable;
(1) (desde C++11)
template< class T >
struct is_trivially_move_assignable;
(2) (desde C++11)
template< class T >
struct is_nothrow_move_assignable;
(3) (desde C++11)
1)
Comprueba si un tipo es MoveAssignable, es decir, tiene un operador mover accesible asignación explícita o implícita. Si el requisito se cumple, un miembro constante value true igual se proporciona, de lo contrario es value false .
Original:
Checks whether a type is MoveAssignable, i.e. has an accessible explicit or implicit move assignment operator. If the requirement is met, a member constant value equal true is provided, otherwise value is false.
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2)
lo mismo que 1), pero la evaluación de la expresión movimiento asignación no llamar a cualquier operación que no es trivial .
Original:
same as 1), but evaluation of the move-assignment expression will not call any operation that is not trivial.
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3)
lo mismo que 1), pero la evaluación de la expresión movimiento asignación no llamar a cualquier operación que no se noexcept .
Original:
same as 1), but the evaluation of the move-assignment expression will not call any operation that is not noexcept.
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Contenido

Inherited from std::integral_constant

Member constants

value
[estático]
true si T is move-assignable, false lo contrario
Original:
true if T is move-assignable, false otherwise
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(miembro público estático constante)

Member functions

operator bool
convierte el objeto a bool, devuelve value
Original:
converts the object to bool, returns value
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(función miembro público)

Member types

Tipo
Original:
Type
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Definition
value_type bool
type std::integral_constant<bool, value>

[editar] Posible implementación

template< class T>
struct is_move_assignable
    : std::is_assignable< typename std::add_lvalue_reference<T>::type,
                          typename std::add_rvalue_reference<T>::type> {};
 
template< class T>
struct is_trivially_move_assignable
    : std::is_trivially_assignable< typename std::add_lvalue_reference<T>::type,
                                    typename std::add_rvalue_reference<T>::type> {};
 
template< class T>
struct is_nothrow_move_assignable
    : std::is_nothrow_assignable< typename std::add_lvalue_reference<T>::type,
                                  typename std::add_rvalue_reference<T>::type> {};

[editar] Ejemplo

#include <iostream>
#include <string>
#include <type_traits>
struct Foo { int n; };
int main() {
    std::cout << std::boolalpha
              << "std::string is nothrow move-assignable? "
              << std::is_nothrow_move_assignable<std::string>::value << '\n'
              << "int[2] is move-assignable? "
              << std::is_move_assignable<int[2]>::value << '\n'
              << "Foo is trivally move-assignable? "
              << std::is_trivially_move_assignable<Foo>::value << '\n';
}

Salida:

std::string is nothrow move-assignable? true
int[2] is move-assignable? false
Foo is trivially move-assignable? true

[editar] Ver también

Comprueba si un tipo tiene un operador de asignación para un argumento específico
Original:
checks if a type has a assignment operator for a specific argument
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(plantilla de clase) [editar]
Comprueba si un tipo tiene un operador de asignación de copia
Original:
checks if a type has a copy assignment operator
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(plantilla de clase) [editar]