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    std::integral_constant

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    C++
     
    Utilities-Bibliothek
     
    Geben Sie Unterstützung
    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)
    is_enum(C++11)
    is_union(C++11)
    is_class(C++11)
    is_function(C++11)
    is_reference(C++11)
    is_lvalue_reference(C++11)
    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)
    (C++11)
    (C++11)
    is_default_constructible
    is_trivially_default_constructible
    is_nothrow_default_constructible    		(C++11)
    (C++11)
    (C++11)
    is_copy_constructible
    is_trivially_copy_constructible
    is_nothrow_copy_constructible    		(C++11)
    (C++11)
    (C++11)
    is_move_constructible
    is_trivially_move_constructible
    is_nothrow_move_constructible    		(C++11)
    (C++11)
    (C++11)
    is_assignable
    is_trivially_assignable
    is_nothrow_assignable    		(C++11)
    (C++11)
    (C++11)
    is_copy_assignable
    is_trivially_copy_assignable
    is_nothrow_copy_assignable    		(C++11)
    (C++11)
    (C++11)
    is_move_assignable
    is_trivially_move_assignable
    is_nothrow_move_assignable    		(C++11)
    (C++11)
    (C++11)
    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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    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)
    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, T v >
    struct integral_constant;
    		(seit C++11)
    std::integral_constant wickelt eine statische Konstante des angegebenen Typs. Es ist die Basisklasse für die C + + Exterieur .
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    std::integral_constant wraps a static constant of specified type. It is the base class for the C++ type traits.
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    Zwei Spezialisierungen für die Art bool sind vorgesehen:
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    Two specializations for the type bool are provided:
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    definiert in Header <type_traits>
    Type
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    Type
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    		 Definition
    true_typestd::integral_constant<bool, true>
    false_typestd::integral_constant<bool, false>

    Inhaltsverzeichnis

    [Bearbeiten]Mitglied Typen

    Type
    Original:
    Type
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    		 Definition
    value_typeT
    typestd::integral_constant<T,v>

    [Bearbeiten]Mitglied Konstanten

    Name
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    Name
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    		 Value
    value
    statische Konstante Ausdruck des Typs T mit dem Wert v
    Original:
    static constant expression of type T with value v
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    [Bearbeiten]Member-Funktionen

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

    [Bearbeiten]Mögliche Implementierung

    template<class T, T v>struct integral_constant {staticconstexpr T value = v;typedef T value_type;typedef integral_constant type;constexpr operator value_type()const{return value;}};

    [Bearbeiten]Beispiel

    #include <iostream>#include <type_traits>   int main(){typedef std::integral_constant<int, 2> two_t;typedef std::integral_constant<int, 4> four_t;   // static_assert(std::is_same<two_t, four_t>::value,// "two_t and four_t are not equal!"); // error: static assertion failed: "two_t and four_t are not a same types"   static_assert(two_t::value*2== four_t::value, "2*2 != 4");   enumclass my_e { e1, e2 };typedef std::integral_constant<my_e, my_e::e1> my_e_e1;typedef std::integral_constant<my_e, my_e::e2> my_e_e2;   // static_assert(my_e_e1::value == my_e::e2,// "my_e_e1::value != my_e::e2");// error: static assertion failed: "my_e_e1::value != my_e::e2"   static_assert(std::is_same<my_e_e2, my_e_e2>::value, "my_e_e2 != my_e_e2");}


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