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Variantes

    std::is_constructible, std::is_trivially_constructible, std::is_nothrow_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
    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)
     
    <tbody> </tbody>
    Déclaré dans l'en-tête <type_traits>
    template< class T, class... Args > struct is_constructible;
    		 (1) (depuis C++11)
    template< class T, class... Args > struct is_trivially_constructible;
    		 (2) (depuis C++11)
    template< class T, class... Args > struct is_nothrow_constructible;
    		 (3) (depuis C++11)

    1)

    Si le T obj(arg1, arg2, ... argN); expression est bien formée, étant donné les références rvalue à Args... comme arguments, fournit du membre de constante value true égale. Pour tout autre type, value est false .
    Original:
    If the expression T obj(arg1, arg2, ... argN); is well-formed, given rvalue references to Args... as arguments, provides the member constant value equal true. For any other type, value is false.
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    2)

    même que 1), mais l'expression constructeur n'appelle pas une opération qui n'est pas anodin .
    Original:
    same as 1), but the constructor expression does not call any operation that is not trivial.
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    3)

    même que 1), mais l'expression constructeur est noexcept .
    Original:
    same as 1), but the 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 constructible from Args... , false autrement
    Original:
    true if T is constructible from Args... , 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>

    Exemple

    #include <iostream>
#include <type_traits>

class Foo {
    int v1;
    double v2;
 public:
    Foo(int n) : v1(n), v2() {}
    Foo(int n, double f) noexcept : v1(n), v2(f) {}
};

int main() {
    std::cout << "Foo is ...\n" << std::boolalpha
              << "\tTrivially-constructible from const Foo&? "
              << std::is_trivially_constructible<Foo, const Foo&>::value << '\n'
              << "\tTrivially-constructible from int? "
              << std::is_trivially_constructible<Foo, int>::value << '\n'
              << "\tConstructible from int? "
              << std::is_constructible<Foo, int>::value << '\n'
              << "\tNothrow-constructible from int? "
              << std::is_nothrow_constructible<Foo, int>::value << '\n'
              << "\tNothrow-constructible from int and double? "
              << std::is_nothrow_constructible<Foo, int, double>::value << '\n';
}

    Résultat : 

    Foo is ...
        Trivially-constructible from const Foo&? true
        Trivially-constructible from int? false
        Constructible from int? true
        Nothrow-constructible from int? false
        Nothrow-constructible from int and double? true

    Voir aussi

    (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)
    (C++11)
    (C++11)
    vérifie si un type a un constructeur déménagement
    Original:
    checks if a type has a move constructor
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    (classe générique) [edit]
    (C++11)
    vérifie si le type spécifié prend en charge les utilisations-allocateur de construction
    Original:
    checks if the specified type supports uses-allocator construction
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    (classe générique) [edit]