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    std::is_const

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    <metanoindex/>

     
    C++
     
    Utilities-Bibliothek
     
    Geben Sie Unterstützung
    Grundtypen
    Original:
    Basic types
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    Grundtypen
    Feste Breite Integer-Typen (C++11)
    Numerische Grenzen
    Original:
    Numeric limits
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    numeric_limits
    C numerische begrenzt Schnittstelle
    Laufzeit-Typinformationen
    Original:
    Runtime type information
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    Exterieur
    Original:
    Type traits
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    Primären Typ Kategorien
    Original:
    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_object(C++11)
    is_scalar(C++11)
    is_compound(C++11)
    is_integral(C++11)
    is_floating_point(C++11)
    is_fundamental(C++11)
    is_arithmetic(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
    Original:
    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
    Original:
    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
    Original:
    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
    Original:
    Type modifications
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    remove_cv
    remove_const
    remove_volatile    		(C++11)
    (C++11)
    (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
    Original:
    Type trait constants
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    integral_constant(C++11)
     
    <tbody> </tbody>
    definiert in Header <type_traits>
    template< class T > struct is_const;
    		 (seit C++11)
    Wenn T a const qualifizierten Typ (das heißt, const oder const volatile) ist, stellt das Mitglied konstanten value gleich true. Für jede andere Art, value ist false .
    Original:
    If T is a const-qualified type (that is, const, or const volatile), provides the member constant value equal true. For any other type, value is false.
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    Inherited from std::integral_constant

    Member constants

    value
    [statisch]
    true wenn T is a const-qualified type , false anders
    Original:
    true if T is a const-qualified type , false otherwise
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    (public static Mitglied konstanten)

    Member functions

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

    Member types

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

    Mögliche Implementierung

    template<class T> struct is_const          : std::false_type {};
template<class T> struct is_const<const T> : std::true_type {};

    Beispiel

    #include <iostream>
#include <type_traits>

int main() 
{
    std::cout << boolalpha;
    std::cout << std::is_const<int>::value << '\n';
    std::cout << std::is_const<const int>::value  << '\n';
}

    Output: 

    false
true

    Siehe auch

    (C++11)
    prüft, ob ein Typ flüchtigen qualifiziert
    Original:
    checks if a type is volatile-qualified
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    (Klassen-Template) [edit]