Espaços nominais
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std::rank

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rank
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Definido no cabeçalho <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.

Índice

Herdado de std::integral_constant

Member constants

value
[estática]
 the number of dimensions of T or zero
(membro estático público constante)

Member functions

operator std::size_t
converte o objeto em std::size_t, retorna value
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converts the object to std::size_t, returns value
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(função pública membro)

Member types

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

[editar] Possível implementação

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] Exemplo

#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';
}

Saída: 

3
4
0

[editar] Veja também

(C++11)
verifica se o tipo é um tipo de matriz
Original:
checks if a type is an array type
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(modelo de classe) [edit]
(C++11)
obtém o tamanho de um tipo de matriz ao longo de uma dimensão especificada
Original:
obtains the size of an array type along a specified dimension
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(modelo de classe) [edit]
(C++11)
remove uma medida do tipo matriz dada
Original:
removes one extent from the given array type
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(modelo de classe) [edit]
(C++11)
 removes all extents from the given array type
(modelo de classe) [edit]
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