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std::remove_all_extents

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< cpp‎ | types
 
 
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remove_all_extents
(C++11)
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Definido en la cabecera <type_traits>
template< class T >
struct remove_all_extents;
(desde C++11)
Si T es una matriz multidimensional de algún tipo X, proporciona el miembro typedef type igual a X, de lo contrario es type T .
Original:
If T is a multidimensional array of some type X, provides the member typedef type equal to X, otherwise type is T.
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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_all_extents { typedef T type;};
 
template<class T>
struct remove_all_extents<T[]> {
    typedef typename remove_all_extents<T>::type type;
};
 
template<class Tp, std::size_t N>
struct remove_all_extents<T[N]> {
    typedef typename remove_all_extents<T>::type type;
};

[editar] Ejemplo

#include <iostream>
#include <type_traits>
#include <typeinfo>
 
template<class A>
void foo(const A&)
{
    typedef typename std::remove_all_extents<A>::type Type;
    std::cout << "underlying type: " << typeid(Type).name() << '\n';
}
 
int main()
{
    float a1[1][2][3];
    int a2[3][2];
    float a3[1][1][1][1][2];
    double a4[2][3];
 
    foo(a1);
    foo(a2);
    foo(a3);
    foo(a4);
}

Salida:

underlying type: f
underlying type: i
underlying type: f
underlying type: d

[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)
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]