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std::alignment_of

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Basic types
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Grundtypen
Feste Breite Integer-Typen (C++11)
Numerische Grenzen
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Numeric limits
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numeric_limits
C numerische begrenzt Schnittstelle
Laufzeit-Typinformationen
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Runtime type information
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Type traits
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is_const(C++11)
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is_same(C++11)
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alignment_of(C++11)
rank(C++11)
extent(C++11)
Typ Modifikationen
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remove_cv
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aligned_storage(C++11)
aligned_union(C++11)
decay(C++11)
enable_if(C++11)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
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Typ-Trait-Konstanten
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Type trait constants
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integral_constant(C++11)
 
Defined 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 .
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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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Inhaltsverzeichnis

Inherited from std::integral_constant

Member constants

value
[statisch]
alignof(typename std::remove_all_extents<T>::type)
(public static Mitglied konstanten)

Member functions

operator std::size_t
wandelt das Objekt std::size_t, gibt value
Original:
converts the object to std::size_t, returns value
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(öffentliche Elementfunktion)

Member types

Type
Original:
Type
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Definition
value_type std::size_t
type std::integral_constant<std::size_t, value>

[Bearbeiten] Mögliche Implementierung

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

[Bearbeiten] 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:

1
4
8

[Bearbeiten] Siehe auch

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