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std::rank

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< cpp‎ | types

 
 
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initializer_list(C++11)
bitset
hash(C++11)
Os operadores relacionais
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
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rel_ops::operator>=
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Pairs and tuples
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pair
tuple(C++11)
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Digite apoio
Tipos básicos
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Basic types
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Tipos fundamentais
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Numeric limits
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C numérico limita interface
Informações de tipo de tempo de execução
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Runtime type information
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Características de tipo
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Type traits
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Principais categorias de tipo
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Primary type categories
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is_void(C++11)
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Propriedades de tipo
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Type properties
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is_const(C++11)
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Supported operations
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is_constructible
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(C++11)
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(C++11)
(C++11)
(C++11)
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(C++11)
(C++11)
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(C++11)
(C++11)
(C++11)
is_assignable
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is_destructible
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(C++11)
(C++11)
has_virtual_destructor(C++11)
Relacionamentos e consultas de propriedade
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Relationships and property queries
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is_same(C++11)
is_base_of(C++11)
is_convertible(C++11)
alignment_of(C++11)
rank(C++11)
extent(C++11)
Tipo modificações
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Type modifications
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remove_cv
remove_const
remove_volatile
(C++11)
(C++11)
(C++11)
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add_const
add_volatile
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(C++11)
(C++11)
make_signed(C++11)
make_unsigned(C++11)
Transformações tipo
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Type transformations
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aligned_storage(C++11)
aligned_union(C++11)
decay(C++11)
enable_if(C++11)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
result_of(C++11)
Digite constantes traço
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Type trait constants
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct rank;
(a partir do 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

Inherited from 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
Original:
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';
}

Output:

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]
remove uma medida do tipo matriz dada
Original:
removes one extent from the given array type
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(modelo de classe) [edit]
removes all extents from the given array type
(modelo de classe) [edit]