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    std::is_move_constructible, std::is_trivially_move_constructible, std::is_nothrow_move_constructible

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    <metanoindex/>

     
    C++
     
    Bibliothèque d'utilitaires
     
    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
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    Numeric limits
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    numeric_limits
    C numérique limite interface
    Informations sur le type d'exécution
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    Runtime type information
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    Caractères de type
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    Type traits
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    Catégories de type primaire
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    Primary type categories
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    is_void (C++11)
    is_array (C++11)
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    is_union (C++11)
    is_class (C++11)
    is_function (C++11)
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    is_floating_point (C++11)
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    Les propriétés du type
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    Type properties
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    is_const (C++11)
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    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
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    Relationships and property queries
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    is_same (C++11)
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    (C++11)
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    Tapez constantes traits
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    Type trait constants
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    integral_constant (C++11)
     
    <tbody> </tbody>
    Déclaré dans l'en-tête <type_traits>
    template< class T > struct is_move_constructible;
    		 (1) (depuis C++11)
    template< class T > struct is_trivially_move_constructible;
    		 (2) (depuis C++11)
    template< class T > struct is_nothrow_move_constructible;
    		 (3) (depuis C++11)

    1)

    Vérifie si un type est MoveConstructible, c'est à dire a un constructeur déménagement accessibles explicite ou implicite. Si la condition est remplie, un membre constant value true égalité est fourni, sinon value est false .
    Original:
    Checks whether a type is MoveConstructible, i.e. has an accessible explicit or implicit move constructor. 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'expression constructeur mouvement n'appelle pas une opération qui n'est pas anodin .
    Original:
    Same as 1), but the move constructor expression does not call any operation that is not trivial.
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    3)

    Identique à 1), mais l'expression constructeur mouvement est noexcept .
    Original:
    Same as 1), but the move constructor expression is noexcept.
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    Inherited from std::integral_constant

    Member constants

    value
    [
    statique
    Original:
    static
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    ]
    true si T is move-constructible , false autrement
    Original:
    true if T is move-constructible , 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>

    Notes

    Déplacer les constructeurs sont généralement noexcept, sinon ils sont inutilisables dans n'importe quel code qui offre une garantie forte exception .
    Original:
    Move constructors are usually noexcept, since otherwise they are unusable in any code that provides strong exception guarantee.
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    Mise en œuvre possible

    template<class T>
struct is_move_constructible :
        std::is_constructible<T, typename std::add_rvalue_reference<T>::type> {};

template<class T>
struct is_trivially_move_constructible :
       std::is_trivially_constructible<T, typename std::add_rvalue_reference<T>::type> {};

template<class T>
struct is_nothrow_move_constructible :
       std::is_nothrow_constructible<T, typename std::add_rvalue_reference<T>::type> {};

    Exemple

    #include <iostream>
#include <type_traits>

struct Ex1 {
    std::string str; // member has a non-trivial but non-throwing move ctor
};
struct Ex2 {
    int n;
    Ex2(Ex2&&) = default; // trivial and non-throwing
};

int main() {
    std::cout << std::boolalpha << "Ex1 is move-constructible? "
              << std::is_move_constructible<Ex1>::value << '\n'
              << "Ex1 is trivially move-constructible? "
              << std::is_trivially_move_constructible<Ex1>::value << '\n'
              << "Ex1 is nothrow move-constructible? "
              << std::is_nothrow_move_constructible<Ex1>::value << '\n'
              << "Ex2 is trivially move-constructible? "
              << std::is_trivially_move_constructible<Ex2>::value << '\n'
              << "Ex2 is nothrow move-constructible? "
              << std::is_nothrow_move_constructible<Ex2>::value << '\n';
}

    Résultat : 

    Ex1 is move-constructible? true
Ex1 is trivially move-constructible? false
Ex1 is nothrow move-constructible? true
Ex2 is trivially move-constructible? true
Ex2 is nothrow move-constructible? true

    Voir aussi

    (C++11)
    (C++11)
    (C++11)
    vérifie si un type a un constructeur pour les arguments spécifiques
    Original:
    checks if a type has a constructor for specific arguments
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    (classe générique) [edit]
    (C++11)
    (C++11)
    (C++11)
    vérifie si un type a un constructeur par défaut
    Original:
    checks if a type has a default constructor
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    (classe générique) [edit]
    (C++11)
    (C++11)
    (C++11)
    vérifie si un type a un constructeur de copie
    Original:
    checks if a type has a copy constructor
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    (classe générique) [edit]
    (C++11)
    obtient une référence rvalue si le constructeur mouvement ne jette pas
    Original:
    obtains an rvalue reference if the move constructor does not throw
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    (fonction générique) [edit]