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std::is_literal_type

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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
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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
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
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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)
is_trivial(C++11)
is_trivially_copyable(C++11)
is_standard_layout(C++11)
is_literal_type(C++11)
is_signed(C++11)
is_unsigned(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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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
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Type trait constants
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integral_constant(C++11)
 
Defined 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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Inhaltsverzeichnis

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>

[Bearbeiten] 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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[Bearbeiten] 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