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std::is_array

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< cpp‎ | types
 
 
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
(C++11)
Operadores relacionales
Original:
Relational operators
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Pares y tuplas
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Pairs and tuples
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(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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(C++11)
(C++11)
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Escriba apoyo
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
Original:
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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(C++11)
is_array
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Propiedades de tipo
Original:
Type properties
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(C++11)
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(C++11)
Operaciones compatibles
Original:
Supported operations
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Relaciones y consultas de propiedad
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Relationships and property queries
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(C++11)
(C++11)
(C++11)
(C++11)
Modificaciones de tipo
Original:
Type modifications
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(C++11)(C++11)(C++11)
Transformaciones de tipo
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Type transformations
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(C++11)
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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_array;
(desde C++11)
Si T es un tipo de matriz, establece en el miembro constante value true iguales. Para cualquier otro tipo, es value false .
Original:
If T is an array type, provides the member constant value equal true. For any other type, value is false.
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Contenido

Inherited from std::integral_constant

Member constants

value
[estático]
true si T is an array type , false lo contrario
Original:
true if T is an array type , 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_array : std::false_type {};
 
template<class T>
struct is_array<T[]> : std::true_type {};
 
template<class T, std::size_t N>
struct is_array<T[N]> : std::true_type {};

[editar] Ejemplo

#include <iostream>
#include <type_traits>
 
class A {};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_array<A>::value << '\n';
    std::cout << std::is_array<A[3]>::value << '\n';
    std::cout << std::is_array<float>::value << '\n';
    std::cout << std::is_array<int>::value << '\n';
    std::cout << std::is_array<int[3]>::value << '\n';
}

Salida:

false
true
false
false
true

[editar] Ver también

(C++11)
obtiene el número de dimensiones de un tipo de matriz
Original:
obtains the number of dimensions of an array type
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(plantilla de clase) [editar]
(C++11)
obtiene el tamaño de un tipo de matriz a lo largo de una dimensión especificada
Original:
obtains the size of an array type along a specified dimension
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(plantilla de clase) [editar]
elimina una extensión del tipo de matriz dada
Original:
removes one extent from the given array type
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(plantilla de clase) [editar]
removes all extents from the given array type
(plantilla de clase) [editar]