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std::alignment_of

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C++
 
Utilities-Bibliothek
 
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Grundtypen
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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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Exterieur
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Type traits
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Primären Typ Kategorien
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Primary type categories
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is_void(C++11)
is_array(C++11)
is_pointer(C++11)
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is_union(C++11)
is_class(C++11)
is_function(C++11)
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is_compound(C++11)
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is_fundamental(C++11)
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is_reference(C++11)
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is_rvalue_reference(C++11)
is_member_pointer(C++11)
is_member_object_pointer(C++11)
is_member_function_pointer(C++11)
Typ Eigenschaften
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Type properties
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is_const(C++11)
is_volatile(C++11)
is_pod(C++11)
is_empty(C++11)
is_polymorphic(C++11)
is_abstract(C++11)
Unterstützte Operationen
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Supported operations
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is_constructible
is_trivially_constructible
is_nothrow_constructible		(C++11)
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is_default_constructible
is_trivially_default_constructible
is_nothrow_default_constructible		(C++11)
(C++11)
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is_copy_constructible
is_trivially_copy_constructible
is_nothrow_copy_constructible		(C++11)
(C++11)
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is_move_constructible
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is_nothrow_move_constructible		(C++11)
(C++11)
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is_assignable
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is_nothrow_assignable		(C++11)
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is_copy_assignable
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is_nothrow_copy_assignable		(C++11)
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is_move_assignable
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is_nothrow_move_assignable		(C++11)
(C++11)
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is_destructible
is_trivially_destructible
is_nothrow_destructible		(C++11)
(C++11)
(C++11)
has_virtual_destructor(C++11)
Beziehungen und Eigentum Abfragen
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Relationships and property queries
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is_same(C++11)
is_base_of(C++11)
is_convertible(C++11)
alignment_of(C++11)
rank(C++11)
extent(C++11)
Typ Modifikationen
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Type modifications
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remove_cv
remove_const
remove_volatile		(C++11)
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(C++11)
add_cv
add_const
add_volatile		(C++11)
(C++11)
(C++11)
make_signed(C++11)
make_unsigned(C++11)
Typ Transformationen
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Type transformations
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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)
result_of(C++11)
Typ-Trait-Konstanten
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Type trait constants
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integral_constant(C++11)
 
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 .
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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]
(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
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(Klassen-Template) [edit]
(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
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(Klassen-Template) [edit]
(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
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(typedef) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/types/alignment_of&oldid=30136“