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std::is_literal_type

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< cpp‎ | types

 
 
 
Soutien aux types fondamentaux
Les types de base
Original:
Basic types
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Types fondamentaux
Fixe les types entiers largeur (C++11)
Limites numériques
Original:
Numeric limits
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numeric_limits
C numérique limite interface
Informations sur le type d'exécution
Original:
Runtime type information
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Caractères de type
Original:
Type traits
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Catégories de type primaire
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)
Les propriétés du type
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)
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)
Opérations prises en charge
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)
Les relations et les requêtes de propriété
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)
Modifications de type
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)
Transformations de type
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)
Tapez constantes traits
Original:
Type trait constants
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integral_constant (C++11)
 
Defined in header <type_traits>
template< class T >
struct is_literal_type;
(depuis C++11)
Si T est un type littéral, fournit du membre de constante value true égale. Pour tout autre type, value est 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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Un type littéral est un scalaire, un type référence ou un type de classe que:
Original:
A literal type is any scalar type, any reference type or a class type that:
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1. a un destructeur trivial
Original:
1. has a trivial destructor
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2. l'ensemble de ses appels de constructeurs et les initialiseurs pour les membres de données non statiques sont des expressions constantes
Original:
2. all of its constructor calls and initializers for nonstatic data members are constant expressions
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3. est un type d'agrégat ou a au moins un constructeur constexpr qui n'est pas une copie ou constructeur mouvement
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. l'ensemble de ses membres non statiques de données et classes de base sont les types littéraux
Original:
4. all of its nonstatic data members and base classes are literal types
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Un tableau de types littéraux est aussi un type littéral .
Original:
An array of literal types is also a literal type.
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Sommaire

Inherited from std::integral_constant

Member constants

value
[
statique
Original:
static
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]
true si T is a literal type, false autrement
Original:
true if T is a literal type, false otherwise
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(constante membre statique publique)

Member functions

operator bool
convertit l'objet en bool, retourne value
Original:
converts the object to bool, returns value
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(fonction membre publique)

Member types

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

[modifier] Notes

Seuls les types littéraux peuvent être utilisés comme paramètres de fonctions ou de retour de constexpr. Seules les classes littérales peuvent avoir des fonctions membres constexpr .
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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[modifier] Exemple

#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';
}

Résultat :

true
false