std::tuple_size(std::array)
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<tbody> </tbody>| Definido no cabeçalho <array>
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template< class T, size_t N > class tuple_size< array<T, N> > : public integral_constant<size_t, N> { }; |
(1) | (desde C++11) |
Permite o acesso ao número de elementos de um std::array como uma expressão constante de tempo de compilação.
Original:
Provides access to the number of elements in an std::array as a compile-time constant expression.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Herdado de std::integral_constant
Member constants
value [estática] |
N, the number of elements in the array (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 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
|
std::size_t
|
type
|
std::integral_constant<std::size_t, value>
|
Exemplo
#include <iostream>
#include <array>
template<class T>
void test(T t)
{
int a[std::tuple_size<T>::value]; // can be used at compile time
std::cout << std::tuple_size<T>::value << '\n';
}
int main()
{
std::array<float, 3> arr;
test(arr);
}
Saída:
3