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std::alignment_of

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alignment_of
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Definido no cabeçalho <type_traits>
template< class T >
struct alignment_of;
 (desde C++11)
Fornece o membro constante value igual ao requisito de alinhamento do T tipo, tal como se obtém por uma expressão alignof. Se T é um tipo de matriz, retorna os requisitos de alinhamento do tipo de elemento.
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Provides the member constant value equal to the alignment requirement of the type T, as if obtained by an alignof expression. If T is an array type, returns the alignment requirements of the element type.
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Índice

Herdado de std::integral_constant

Member constants

value
[estática]
 alignof(typename std::remove_all_extents<T>::type)
(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
Original:
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 alignment_of : std::integral_constant<
                          std::size_t,
                          alignof(typename std::remove_all_extents<T>::type)
                       > {};

[editar] Exemplo

#include <iostream>
#include <type_traits>
 
class A {};
 
int main() 
{
    std::cout << std::alignment_of<A>::value << '\n';
    std::cout << std::alignment_of<int>::value << '\n';
    std::cout << std::alignment_of<double>::value << '\n';
}

Saída: 

1
4
8

[editar] Veja também

alignof operator queries alignment requirements of a type (desde C++11) [edit]
(C++11)
define o tipo adequado para utilização como armazenamento não inicializada para tipos de determinado tamanho
Original:
defines the type suitable for use as uninitialized storage for types of given size
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(modelo de classe) [edit]
(C++11)
define o tipo adequado para utilização como armazenamento não inicializados para todos os tipos de dados
Original:
defines the type suitable for use as uninitialized storage for all given types
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(modelo de classe) [edit]
(C++11)
Tipo POD com exigência de alinhamento tão grande quanto qualquer outro tipo escalar
Original:
POD type with alignment requirement as great as any other scalar type
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(typedef) [edit]
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