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    std::is_constructible, std::is_trivially_constructible, std::is_nothrow_constructible

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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
    Original:
    Type modifications
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    Typ Transformationen
    Original:
    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, class... Args>
    struct is_constructible;
    		 (1) (seit C++11)
    template<class T, class... Args>
    struct is_trivially_constructible;
    		 (2) (seit C++11)
    template<class T, class... Args>
    struct is_nothrow_constructible;
    		 (3) (seit C++11)
    1)
    Wenn der Ausdruck T obj(arg1, arg2, ... argN); ist wohlgeformt, da rvalue Verweise auf Args... als Argumente, bietet das Mitglied konstanten value gleich true. Für jede andere Art, value ist false .
    Original:
    If the expression T obj(arg1, arg2, ... argN); is well-formed, given rvalue references to Args... as arguments, provides the member constant value equal true. For any other type, value is false.
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    2)
    wie 1), aber der Konstruktor Ausdruck nicht nennen jede Operation, die nicht trivial ist .
    Original:
    same as 1), but the constructor expression does not call any operation that is not trivial.
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    3)
    Gleiche wie 1), aber der Konstruktor Expression noexcept .
    Original:
    same as 1), but the constructor expression is noexcept.
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    Inhaltsverzeichnis

    Inherited from std::integral_constant

    Member constants

    value
    [statisch]
    true wenn T is constructible from Args... , false anders
    Original:
    true if T is constructible from Args... , 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]Beispiel

    #include <iostream>#include <type_traits>   class Foo {int v1;double v2;public: Foo(int n): v1(n), v2(){} Foo(int n, double f)noexcept: v1(n), v2(f){}};   int main(){std::cout<<"Foo is ...\n"<<std::boolalpha<<"\tTrivially-constructible from const Foo&? "<< std::is_trivially_constructible<Foo, const Foo&>::value<<'\n'<<"\tTrivially-constructible from int? "<< std::is_trivially_constructible<Foo, int>::value<<'\n'<<"\tConstructible from int? "<< std::is_constructible<Foo, int>::value<<'\n'<<"\tNothrow-constructible from int? "<< std::is_nothrow_constructible<Foo, int>::value<<'\n'<<"\tNothrow-constructible from int and double? "<< std::is_nothrow_constructible<Foo, int, double>::value<<'\n';}

    Output: 

    Foo is ... Trivially-constructible from const Foo&? true Trivially-constructible from int? false Constructible from int? true Nothrow-constructible from int? false Nothrow-constructible from int and double? true

    [Bearbeiten]Siehe auch

    (C++11)
    (C++11)
    (C++11)
    prüft, ob ein Typ hat einen Default-Konstruktor
    Original:
    checks if a type has a default constructor
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    (Klassen-Template)[edit]
    (C++11)
    (C++11)
    (C++11)
    prüft, ob ein Typ hat einen Copy-Konstruktor
    Original:
    checks if a type has a copy constructor
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    (Klassen-Template)[edit]
    (C++11)
    (C++11)
    (C++11)
    prüft, ob ein Typ hat einen Umzug Konstruktor
    Original:
    checks if a type has a move constructor
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    (Klassen-Template)[edit]
    (C++11)
    		 prüft, ob der angegebene Typ allokatorgestützte Erzeugung unterstützt.
    (Klassen-Template)[edit]
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/types/is_constructible&oldid=30172“
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