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    std::is_literal_type

    Aus cppreference.com

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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
    Original:
    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_literal_type;
    		 (seit C++11)
    Wenn T eine wörtliche Typ ist, bietet das Mitglied konstanten value gleich true. Für jede andere Art, value ist false .
    Original:
    If T is a literal type, provides the member constant value equal true. For any other type, value is false.
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    Eine wörtliche Typ ist eine skalare Typ, jede Bezugnahme Typ oder eine Klasse-Typ, dass:
    Original:
    A literal type is any scalar type, any reference type or a class type that:
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    Ein. hat einen trivialen Destruktor
    Original:
    1. has a trivial destructor
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    2. all seinen Konstruktor Anrufe und Initialisierungen für nichtstatische Daten Mitglieder sind konstante Ausdrücke
    Original:
    2. all of its constructor calls and initializers for nonstatic data members are constant expressions
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    3. ist ein Aggregat Typ oder mindestens ein constexpr Konstruktor, kein Kopieren oder Verschieben Konstruktor
    Original:
    3. is an aggregate type or has at least one constexpr constructor that is not a copy or move constructor
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    4. alle seine nichtstatische Datenelemente und Basisklassen sind wörtliche Typen
    Original:
    4. all of its nonstatic data members and base classes are literal types
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    Ein Array von literal-Typen ist auch eine wörtliche Typ .
    Original:
    An array of literal types is also a literal type.
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    Inherited from std::integral_constant

    Member constants

    value
    [statisch]
    true wenn T is a literal type, false anders
    Original:
    true if T is a literal 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>

    Notes

    Nur wörtliche Typen können als Parameter verwendet werden oder Retouren aus constexpr Funktionen. Nur wörtliche Klassen können constexpr Elementfunktionen .
    Original:
    Only literal types may be used as parameters to or returned from constexpr functions. Only literal classes may have constexpr member functions.
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    Beispiel

    #include <iostream>
#include <type_traits>

struct A {
    int m;
};

struct B {
    virtual ~B();
};

int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_literal_type<A>::value << '\n';
    std::cout << std::is_literal_type<B>::value << '\n';
}

    Output: 

    true
false