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

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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)
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_copy_assignable;
(1) (depuis C++11)
template< class T >
struct is_trivially_copy_assignable;
(2) (depuis C++11)
template< class T >
struct is_nothrow_copy_assignable;
(3) (depuis C++11)
1)
Vérifie si un type est CopyAssignable, c'est à dire accessible a un opérateur explicite ou implicite, affectation par copie. Si la condition est remplie, un membre constant value true égalité est fourni, sinon value est 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)
Identique à 1), mais l'évaluation de l'expression de copie affectation ne sera pas appeler toute opération qui n'est pas anodin .
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)
Identique à 1), mais l'évaluation de l'expression de copie affectation ne sera pas appeler toute opération qui n'est pas noexcept .
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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Sommaire

Inherited from std::integral_constant

Member constants

value
[
statique
Original:
static
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]
true si T is copy-assignable, false autrement
Original:
true if T is copy-assignable, 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] Mise en œuvre possible

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

[modifier] Exemple

#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';
}

Résultat :

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

[modifier] Voir aussi

vérifie si un type a un opérateur d'affectation d'un argument spécifique
Original:
checks if a type has a assignment operator for a specific argument
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(classe générique) [edit]
vérifie si un type a un opérateur d'affectation mouvement
Original:
checks if a type has a move assignment operator
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(classe générique) [edit]