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std::is_array

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C++
 
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initializer_list(C++11)
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Os operadores relacionais
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rel_ops::operator!=
rel_ops::operator>
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Pairs and tuples
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is_void(C++11)
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is_constructible
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(C++11)
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is_copy_constructible
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is_nothrow_copy_constructible		(C++11)
(C++11)
(C++11)
is_move_constructible
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is_nothrow_move_constructible		(C++11)
(C++11)
(C++11)
is_assignable
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is_nothrow_assignable		(C++11)
(C++11)
(C++11)
is_copy_assignable
is_trivially_copy_assignable
is_nothrow_copy_assignable		(C++11)
(C++11)
(C++11)
is_move_assignable
is_trivially_move_assignable
is_nothrow_move_assignable		(C++11)
(C++11)
(C++11)
is_destructible
is_trivially_destructible
is_nothrow_destructible		(C++11)
(C++11)
(C++11)
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Digite constantes traço
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_array;
 (a partir do C++ 11)
Se T é um tipo de matriz, fornece o membro constante value true igual. Para qualquer outro tipo, é value false.
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If T is an array type, provides the member constant value equal true. For any other type, value is false.
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Índice

Inherited from std::integral_constant

Member constants

value
[estática]
true se T is an array type , false contrário
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true if T is an array type , false otherwise
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(membro estático público constante)

Member functions

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

Member types

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

[editar] Possível implementação

template<class T>
struct is_array : std::false_type {};
 
template<class T>
struct is_array<T[]> : std::true_type {};
 
template<class T, std::size_t N>
struct is_array<T[N]> : std::true_type {};

[editar] Exemplo

#include <iostream>
#include <type_traits>
 
class A {};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_array<A>::value << '\n';
    std::cout << std::is_array<A[3]>::value << '\n';
    std::cout << std::is_array<float>::value << '\n';
    std::cout << std::is_array<int>::value << '\n';
    std::cout << std::is_array<int[3]>::value << '\n';
}

Output: 

false
true
false
false
true

[editar] Veja também

(C++11)
obtém o número de dimensões de um tipo de matriz
Original:
obtains the number of dimensions of 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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