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    std::is_copy_assignable, std::is_trivially_copy_assignable, std::is_nothrow_copy_assignable

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    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_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
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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
    Original:
    Type trait constants
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    integral_constant(C++11)
     
    definiert in Header <type_traits>
    template<class T >
    struct is_copy_assignable;
    		 (1) (seit C++11)
    template<class T >
    struct is_trivially_copy_assignable;
    		 (2) (seit C++11)
    template<class T >
    struct is_nothrow_copy_assignable;
    		 (3) (seit C++11)
    1)
    Prüft, ob eine Art CopyAssignable ist, dh eine zugängliche explizite oder implizite Zuweisungsoperator. Wenn die Bedingung erfüllt ist, ein Mitglied konstanten value gleich true bereitgestellt wird, sonst value ist false .
    Original:
    Checks whether a type is CopyAssignable, i.e. has an accessible explicit or implicit copy assignment operator. If the requirement is met, a member constant value equal true is provided, otherwise value is false.
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    2)
    Gleiche wie 1), aber eine Evaluierung der copy-Zuweisungsausdruck nicht nennen sämtliche Aufgaben, die nicht trivial ist .
    Original:
    Same as 1), but evaluation of the copy-assignment expression will not call any operation that is not trivial.
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    3)
    Gleiche wie 1), aber die Auswertung der copy-Zuweisungsausdruck nicht nennen jede Operation, die nicht noexcept wird .
    Original:
    Same as 1), but the evaluation of the copy-assignment expression will not call any operation that is not noexcept.
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    Inhaltsverzeichnis

    Inherited from std::integral_constant

    Member constants

    value
    [statisch]
    true wenn T is copy-assignable, false anders
    Original:
    true if T is copy-assignable, 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_typebool
    typestd::integral_constant<bool, value>

    [Bearbeiten]Mögliche Implementierung

    template<class T>struct is_copy_assignable :std::is_assignable<typenamestd::add_lvalue_reference<T>::type, consttypenamestd::add_lvalue_reference<T>::type>{};   template<class T>struct is_trivially_copy_assignable :std::is_trivially_assignable<typenamestd::add_lvalue_reference<T>::type, consttypenamestd::add_lvalue_reference<T>::type>{};   template<class T>struct is_nothrow_copy_assignable :std::is_nothrow_assignable<typenamestd::add_lvalue_reference<T>::type, consttypenamestd::add_lvalue_reference<T>::type>{};

    [Bearbeiten]Beispiel

    #include <iostream>#include <utility>#include <type_traits>struct Foo {int n;};int main(){std::cout<<std::boolalpha<<"Foo is trivally copy-assignable? "<< std::is_trivially_copy_assignable<Foo>::value<<'\n'<<"int[2] is copy-assignable? "<< std::is_copy_assignable<int[2]>::value<<'\n'<<"int is nothrow copy-assignable? "<< std::is_nothrow_copy_assignable<int>::value<<'\n';}

    Output: 

    Foo is trivally copy-assignable? true int[2] is copy-assignable? false int is nothrow copy-assignable? true

    [Bearbeiten]Siehe auch

    (C++11)
    (C++11)
    (C++11)
    prüft, ob ein Typ hat einen Zuweisungsoperator für eine bestimmte Argument
    Original:
    checks if a type has a assignment operator for a specific argument
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    (Klassen-Template)[edit]
    (C++11)
    (C++11)
    (C++11)
    prüft, ob ein Typ hat einen Umzug Zuweisungsoperator
    Original:
    checks if a type has a move assignment operator
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    (Klassen-Template)[edit]
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/types/is_copy_assignable&oldid=30176“
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