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std::extent

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extent
(C++11)
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Definido en la cabecera <type_traits>
template< class T, unsigned N = 0>
struct extent;
(desde C++11)

If T is an array type, provides the member constant value equal to the number of elements along the Nth dimension of the array, if N is in [0, std::rank<T>::value). For any other type, or if T is array of unknown bound along its first dimension and N is 0, value is 0.

Contenido

Inherited from std::integral_constant

Member constants

value
[estático]
the number of elements along the Nth dimension of T
(miembro público estático constante)

Member functions

operator std::size_t
convierte el objeto a std::size_t, devuelve value
Original:
converts the object to std::size_t, returns value
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(función miembro público)

Member types

Tipo
Original:
Type
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Definition
value_type std::size_t
type std::integral_constant<std::size_t, value>

[editar] Posible implementación

template<class T, unsigned N = 0>
struct extent : std::integral_constant<std::size_t, 0> {};
 
template<class T>
struct extent<T[], 0> : std::integral_constant<std::size_t, 0> {};
 
template<class T, unsigned N>
struct extent<T[], N> : std::integral_constant<std::size_t, std::extent<T, N-1>::value> {};
 
template<class T, std::size_t N>
struct extent<T[N], 0> : std::integral_constant<std::size_t, N> {};
 
template<class T, std::size_t I, unsigned N>
struct extent<T[I], N> : std::integral_constant<std::size_t, std::extent<T, N-1>::value> {};

[editar] Ejemplo

#include <iostream>
#include <type_traits>
 
int main()
{
    std::cout << std::extent<int[3]>::value << '\n';
    std::cout << std::extent<int[3][4]>::value << '\n';
    std::cout << std::extent<int[3][4],1>::value << '\n';
    std::cout << std::extent<int[3][4],2>::value << '\n';
    std::cout << std::extent<int[]>::value << '\n';
}

Salida:

3
3
4
0
0

[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]
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]