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    std::rank

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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)
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    Typ Eigenschaften
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    is_const(C++11)
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    is_pod(C++11)
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    Unterstützte Operationen
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    Supported operations
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    is_constructible
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    (C++11)
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    is_destructible
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    is_nothrow_destructible    		(C++11)
    (C++11)
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    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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    aligned_storage(C++11)
    aligned_union(C++11)
    decay(C++11)
    enable_if(C++11)
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    Type trait constants
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    integral_constant(C++11)
     
    definiert in Header <type_traits>
    template<class T >
    struct rank;
    		(seit C++11)

    If T is an array type, provides the member constant value equal to the number of dimensions of the array. For any other type, value is 0.

    Inhaltsverzeichnis

    Inherited from std::integral_constant

    Member constants

    value
    [statisch]
    		 the number of dimensions of T or zero
    (public static Mitglied konstanten)

    Member functions

    operator std::size_t
    wandelt das Objekt std::size_t, gibt value
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    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 rank :std::integral_constant<std::size_t, 0>{};   template<class T>struct rank<T[]>:publicstd::integral_constant<std::size_t, rank<T>::value+1>{};   template<class T, size_t N>struct rank<T[N]>:publicstd::integral_constant<std::size_t, rank<T>::value+1>{};

    [Bearbeiten]Beispiel

    #include <iostream>#include <type_traits>   int main(){std::cout<< std::rank<int[1][2][3]>::value<<'\n';std::cout<< std::rank<int[][2][3][4]>::value<<'\n';std::cout<< std::rank<int>::value<<'\n';}

    Output: 

    3 4 0

    [Bearbeiten]Siehe auch

    (C++11)
    prüft, ob ein Typ ist ein Array-Typ
    Original:
    checks if a type is an array type
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    (Klassen-Template)[edit]
    (C++11)
    erhält die Größe eines Array-Typs entlang einer bestimmten Dimension
    Original:
    obtains the size of an array type along a specified dimension
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    (Klassen-Template)[edit]
    (C++11)
    Entfernt ein Teil aus dem angegebenen Array-Typ
    Original:
    removes one extent from the given array type
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    (Klassen-Template)[edit]
    (C++11)
    		 removes all extents from the given array type
    (Klassen-Template)[edit]
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/types/rank&oldid=30348“
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