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std::rank

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< cpp‎ | types

 
 
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rank
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Definido en la cabecera <type_traits>
template< class T >
struct rank;
(desde C++11)

If T is an array type, provides the member constant value equal to the number of dimensions of the array. For any other type, value is 0.

Contenido

Inherited from std::integral_constant

Member constants

value
[estático]
the number of dimensions of T or zero
(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>
struct rank : std::integral_constant<std::size_t, 0> {};
 
template<class T>
struct rank<T[]> : public std::integral_constant<std::size_t, rank<T>::value + 1> {};
 
template<class T, size_t N>
struct rank<T[N]> : public std::integral_constant<std::size_t, rank<T>::value + 1> {};

[editar] Ejemplo

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

Salida:

3
4
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 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]