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std::is_pointer

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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
Original:
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)
(C++11)
 
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
Original:
Type traits
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Categorías primarias de tipo
Original:
Primary type categories
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(C++11)
(C++11)
is_pointer
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Propiedades de tipo
Original:
Type properties
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(C++11)
(C++11)
(C++11)
Operaciones compatibles
Original:
Supported operations
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Relaciones y consultas de propiedad
Original:
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
Original:
Type transformations
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(C++11)
(C++11)
(C++11)
Escriba constantes rasgos
Original:
Type trait constants
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Definido en la cabecera <type_traits>
template< class T >
struct is_pointer;
(desde C++11)
Si T es un tipo de puntero objeto o un tipo de puntero de función (pero no puntero al objeto de miembro no estático o función miembro), proporciona la value miembro true constante igual. Para cualquier otro tipo, es value false .
Original:
If T is an object pointer type or a function pointer type (but not pointer to non-static member object or member function), 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 a pointer type , false lo contrario
Original:
true if T is a pointer 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_pointer_helper     : std::false_type {};
template< class T > struct is_pointer_helper<T*> : std::true_type {};
template< class T > struct is_pointer : is_pointer_helper<typename std::remove_cv<T>::type> {};

[editar] Ejemplo

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

Salida:

false
true
false
false
true
true

[editar] Ver también

(C++11)
Comprueba si un tipo es un tipo de matriz
Original:
checks if a type is an array type
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(plantilla de clase) [editar]
(C++11)
Comprueba si un tipo es de tipo escalar
Original:
checks if a type is scalar type
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(plantilla de clase) [editar]