std::alignment_of – cppreference.com

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definiert in Header `<type_traits>`

`template< class T > struct alignment_of;`		(seit C++11)

Bietet das Mitglied konstanten value gleich der Angleichung Voraussetzung des Typs T, als ob durch einen alignof Ausdruck erhalten. Wenn T ein Array-Typ ist, gibt die Ausrichtung Anforderungen der Element-Typ .

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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Inherited from std::integral_constant

Member constants


	`alignof(typename std::remove_all_extents<T>::type)` (public static Mitglied konstanten)

Member functions


	wandelt das Objekt `std::size_t`, gibt `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. (öffentliche Elementfunktion)

Member types


Type 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>`

Mögliche Implementierung

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

Beispiel

#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';
}

Output:

Siehe auch


alignof operator	queries alignment requirements of a type (seit C++11) [edit]

aligned_storage (C++11)	definiert den Typ für die Verwendung als Speicher für initialisierten Arten von vorgegebener Größe Original: defines the type suitable for use as uninitialized storage for types of given size The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]

aligned_union (C++11)	definiert die Art geeignet zur Verwendung als Speicher für alle initialisierten gegebenen Typen Original: defines the type suitable for use as uninitialized storage for all given types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]

max_align_t (C++11)	POD-Typ mit Angleichung Voraussetzung so groß wie alle anderen skalaren Typ Original: POD type with alignment requirement as great as any other scalar type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (typedef) [edit]