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std::is_move_constructible, std::is_trivially_move_constructible, std::is_nothrow_move_constructible

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C++
 
Utilidades de la biblioteca
Escriba apoyo (basic types, RTTI, type traits)
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Objetos Function
initializer_list(C++11)
bitset
hash(C++11)
Operadores relacionales
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares y tuplas
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Cambiar, hacia adelante y mover
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
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Tipos básicos
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Basic types
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Tipos fundamentales
Tipos fijos ancho enteros (C++11)
Límites numéricos
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Numeric limits
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numeric_limits
C numérico limita interfaz
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Runtime type information
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Type traits
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Categorías primarias de tipo
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is_void(C++11)
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is_const(C++11)
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is_empty(C++11)
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is_abstract(C++11)
Operaciones compatibles
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Supported operations
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is_constructible
is_trivially_constructible
is_nothrow_constructible		(C++11)
(C++11)
(C++11)
is_default_constructible
is_trivially_default_constructible
is_nothrow_default_constructible		(C++11)
(C++11)
(C++11)
is_copy_constructible
is_trivially_copy_constructible
is_nothrow_copy_constructible		(C++11)
(C++11)
(C++11)
is_move_constructible
is_trivially_move_constructible
is_nothrow_move_constructible		(C++11)
(C++11)
(C++11)
is_assignable
is_trivially_assignable
is_nothrow_assignable		(C++11)
(C++11)
(C++11)
is_copy_assignable
is_trivially_copy_assignable
is_nothrow_copy_assignable		(C++11)
(C++11)
(C++11)
is_move_assignable
is_trivially_move_assignable
is_nothrow_move_assignable		(C++11)
(C++11)
(C++11)
is_destructible
is_trivially_destructible
is_nothrow_destructible		(C++11)
(C++11)
(C++11)
has_virtual_destructor(C++11)
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Relationships and property queries
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is_same(C++11)
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Modificaciones de tipo
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remove_cv
remove_const
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(C++11)
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add_volatile		(C++11)
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Transformaciones de tipo
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Type transformations
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Type trait constants
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_move_constructible;
 (1) (ya que C + +11)
template< class T >
struct is_trivially_move_constructible;
 (2) (ya que C + +11)
template< class T >
struct is_nothrow_move_constructible;
 (3) (ya que C + +11)
1)
Comprueba si un tipo es MoveConstructible, es decir, tiene un constructor accesible movimiento explícito o implícito. 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 MoveConstructible, i.e. has an accessible explicit or implicit move constructor. If the requirement is met, a member constant value equal true is provided, otherwise value is false.
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2)
Igual que el 1), pero la expresión constructor movimiento no llama a ninguna operación que no es trivial .
Original:
Same as 1), but the move constructor expression does not call any operation that is not trivial.
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3)
Igual que 1), pero la expresión constructor movimiento se noexcept .
Original:
Same as 1), but the move constructor expression is noexcept.
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Contenido

Inherited from std::integral_constant

Member constants

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

Member functions

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

Member types

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

[editar] Notas

Mueva los constructores suelen noexcept, ya que de lo contrario no se pueden utilizar en cualquier código que proporciona garantía excepción fuerte .
Original:
Move constructors are usually noexcept, since otherwise they are unusable in any code that provides strong exception guarantee.
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[editar] Posible implementación

template<class T>
struct is_move_constructible :
        std::is_constructible<T, typename std::add_rvalue_reference<T>::type> {};
 
template<class T>
struct is_trivially_move_constructible :
       std::is_trivially_constructible<T, typename std::add_rvalue_reference<T>::type> {};
 
template<class T>
struct is_nothrow_move_constructible :
       std::is_nothrow_constructible<T, typename std::add_rvalue_reference<T>::type> {};

[editar] Ejemplo

#include <iostream>
#include <type_traits>
 
struct Ex1 {
    std::string str; // member has a non-trivial but non-throwing move ctor
};
struct Ex2 {
    int n;
    Ex2(Ex2&&) = default; // trivial and non-throwing
};
 
int main() {
    std::cout << std::boolalpha << "Ex1 is move-constructible? "
              << std::is_move_constructible<Ex1>::value << '\n'
              << "Ex1 is trivially move-constructible? "
              << std::is_trivially_move_constructible<Ex1>::value << '\n'
              << "Ex1 is nothrow move-constructible? "
              << std::is_nothrow_move_constructible<Ex1>::value << '\n'
              << "Ex2 is trivially move-constructible? "
              << std::is_trivially_move_constructible<Ex2>::value << '\n'
              << "Ex2 is nothrow move-constructible? "
              << std::is_nothrow_move_constructible<Ex2>::value << '\n';
}

Output: 

Ex1 is move-constructible? true
Ex1 is trivially move-constructible? false
Ex1 is nothrow move-constructible? true
Ex2 is trivially move-constructible? true
Ex2 is nothrow move-constructible? true

[editar] Ver también

(C++11)
(C++11)
(C++11)
Comprueba si un tipo tiene un constructor de argumentos concretos
Original:
checks if a type has a constructor for specific arguments
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(clase de plantilla) [edit]
(C++11)
(C++11)
(C++11)
Comprueba si un tipo tiene un constructor por defecto
Original:
checks if a type has a default constructor
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(clase de plantilla) [edit]
(C++11)
(C++11)
(C++11)
Comprueba si un tipo tiene un constructor de copia
Original:
checks if a type has a copy constructor
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(clase de plantilla) [edit]
(C++11)
obtiene una referencia de valor-si el constructor movimiento no tira
Original:
obtains an rvalue reference if the move constructor does not throw
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(función de plantilla) [edit]
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/types/is_move_constructible&oldid=21827»