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    std::alignment_of

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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(typenamestd::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
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    Type
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    		 Definition
    value_typestd::size_t
    typestd::integral_constant<std::size_t, value>

    [Bearbeiten]Mögliche Implementierung

    template<class T >struct alignment_of :std::integral_constant<std::size_t, alignof(typenamestd::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“
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