std::is_array
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| Definido no cabeçalho <type_traits>
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| template< class T > struct is_array; |
(desde C++11) | |
Se
T é um tipo de matriz, fornece o membro constante value true igual. Para qualquer outro tipo, é value false.Original:
If
T is an array type, provides the member constant value equal true. For any other type, value is false.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Índice |
Herdado de std::integral_constant
Member constants
| value [estática] |
true se T is an array type , false contrário Original: true if T is an array type , false otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (membro estático público constante) |
Member functions
| operator bool |
converte o objeto em bool, retorna value Original: converts the object to bool, returns value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) |
Member types
| Tipo
Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Definition |
value_type
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bool
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type
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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'; }
Saída:
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) |
| (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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) |
| (C++11) |
remove uma medida do tipo matriz dada Original: removes one extent from the given array type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) |
| (C++11) |
removes all extents from the given array type (modelo de classe) |
