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std::remove_extent

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Defined in header <type_traits>
template< class T >
struct remove_extent;
 (ya que C + +11)
Si T es una matriz de algún tipo X, proporciona el miembro typedef type igual a X, de lo contrario type es T. Tenga en cuenta que si T es una matriz multidimensional, sólo la primera dimensión se elimina .
Original:
If T is an array of some type X, provides the member typedef type equal to X, otherwise type is T. Note that if T is a multidimensional array, only the first dimension is removed.
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Contenido

[editar] Tipos de miembros

Nombre
Original:
Name
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 Definition
type
el tipo del elemento de T
Original:
the type of the element of T
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[editar] Posible implementación

template<class T>
struct remove_extent { typedef T type; };
 
template<class T>
struct remove_extent<T[]> { typedef T type; };
 
template<class T, std::size_t N>
struct remove_extent<T[N]> { typedef T type;};

[editar] Ejemplo

#include <iostream>
#include <iterator>
#include <algorithm>
#include <type_traits>
 
template<class A>
typename std::enable_if< std::rank<A>::value == 1 >::type
print_1d(const A& a)
{
    copy(a, a+std::extent<A>::value,
         std::ostream_iterator<typename std::remove_extent<A>::type>(std::cout, " "));
    std::cout << '\n';
}
 
int main()
{
    int a[][3] = {{1,2,3},{4,5,6}};
//  print_1d(a); // compile-time error
    print_1d(a[1]);
}

Output: 

4 5 6

[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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(clase de plantilla) [edit]
(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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(clase de plantilla) [edit]
(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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(clase de plantilla) [edit]
(C++11)
 removes all extents from the given array type
(clase de plantilla) [edit]
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/types/remove_extent&oldid=21234»