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std::is_assignable, std::is_trivially_assignable, std::is_nothrow_assignable

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C++
 
Utilidades de la biblioteca
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
initializer_list(C++11)
bitset
hash(C++11)
Operadores relacionales
Original:
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)
 
Escriba apoyo
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
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
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Primary type categories
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is_void(C++11)
is_array(C++11)
is_pointer(C++11)
is_enum(C++11)
is_union(C++11)
is_class(C++11)
is_function(C++11)
is_object(C++11)
is_scalar(C++11)
is_compound(C++11)
is_integral(C++11)
is_floating_point(C++11)
is_fundamental(C++11)
is_arithmetic(C++11)
is_reference(C++11)
is_lvalue_reference(C++11)
is_rvalue_reference(C++11)
is_member_pointer(C++11)
is_member_object_pointer(C++11)
is_member_function_pointer(C++11)
Propiedades de tipo
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Type properties
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is_const(C++11)
is_volatile(C++11)
is_pod(C++11)
is_empty(C++11)
is_polymorphic(C++11)
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)
Relaciones y consultas de propiedad
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Relationships and property queries
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is_same(C++11)
is_base_of(C++11)
is_convertible(C++11)
alignment_of(C++11)
rank(C++11)
extent(C++11)
Modificaciones de tipo
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Type modifications
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remove_cv
remove_const
remove_volatile		(C++11)
(C++11)
(C++11)
add_cv
add_const
add_volatile		(C++11)
(C++11)
(C++11)
make_signed(C++11)
make_unsigned(C++11)
Transformaciones de tipo
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Type transformations
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aligned_storage(C++11)
aligned_union(C++11)
decay(C++11)
enable_if(C++11)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
result_of(C++11)
Escriba constantes rasgos
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Type trait constants
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T, class U >
struct is_assignable;
 (1) (ya que C + +11)
template< class T, class U >
struct is_trivially_assignable;
 (2) (ya que C + +11)
template< class T, class U >
struct is_nothrow_assignable;
 (3) (ya que C + +11)
1)
Si el std::declval<T>() = std::declval<U>() expresión está bien formado en su contexto sin evaluar, la proporciona el miembro constante value true iguales. Para cualquier otro tipo, es value false .
Original:
If the expression std::declval<T>() = std::declval<U>() is well-formed in unevaluated context, provides the member constant value equal true. For any other type, value is false.
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2)
lo mismo que 1), pero la evaluación de la expresión de asignación no llamar a cualquier operación que no es trivial .
Original:
same as 1), but evaluation of the 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 de asignación no llamar a cualquier operación que no se noexcept .
Original:
same as 1), but the evaluation of the 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 assignable from U , false lo contrario
Original:
true if T is assignable from U , 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] Ejemplo

#include <iostream>
#include <string>
#include <type_traits>
struct Ex1 { int n; };
int main() {
    std::cout << std::boolalpha
              << "int is assignable from double? "
              << std::is_assignable<int, double>::value << '\n'
              << "int& is nothrow assignable from double? "
              << std::is_nothrow_assignable<int&, double>::value << '\n'
              << "string is assignable from double? "
              << std::is_assignable<std::string, double>::value << '\n'
              << "Ex1& is trivially assignable from const Ex1&? "
              << std::is_trivially_assignable<Ex1&, const Ex1&>::value << '\n';
}

Output: 

int is assignable from double? false
int& is nothrow assignable from double? true
string is assignable from double? true
Ex1& is trivially assignable from const Ex1&? true

[editar] Ver también

(C++11)
(C++11)
(C++11)
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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(clase de plantilla) [edit]
(C++11)
(C++11)
(C++11)
Comprueba si un tipo tiene un operador de asignación movimiento
Original:
checks if a type has a move assignment operator
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(clase de plantilla) [edit]
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/types/is_assignable&oldid=22018»