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std::alignment_of

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alignment_of
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Definido en la cabecera <type_traits>
template< class T >
struct alignment_of;
(desde C++11)
Proporciona el miembro constante value igual al requisito de alineación de la T tipo, como si se obtienen por una expresión alignof. Si T es un tipo de matriz, devuelve los requisitos de alineación del tipo de elemento .
Original:
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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Contenido

Inherited from std::integral_constant

Member constants

value
[estático]
alignof(typename std::remove_all_extents<T>::type)
(miembro público estático constante)

Member functions

operator std::size_t
convierte el objeto a std::size_t, devuelve value
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converts the object to std::size_t, returns value
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(función miembro público)

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] Posible implementación

template< class T >
struct alignment_of : std::integral_constant<
                          std::size_t,
                          alignof(typename std::remove_all_extents<T>::type)
                       > {};

[editar] Ejemplo

#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';
}

Salida:

1
4
8

[editar] Ver también

alignof operator queries alignment requirements of a type (desde C++11) [editar]
lo contrario. define el tipo adecuado para su uso como almacenamiento sin inicializar para tipos de tamaño dado
Original:
defines the type suitable for use as uninitialized storage for types of given size
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(plantilla de clase) [editar]
define el tipo adecuado para su uso como almacenamiento sin inicializar todos los tipos dados
Original:
defines the type suitable for use as uninitialized storage for all given types
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(plantilla de clase) [editar]
Tipo POD con el requisito de alineación tan grande como cualquier otro tipo escalar
Original:
POD type with alignment requirement as great as any other scalar type
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(typedef) [editar]