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std::is_convertible

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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)
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
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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)
Modifications de type
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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)
Transformations de type
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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)
Tapez constantes traits
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Type trait constants
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integral_constant (C++11)
 
Défini dans l'entête <type_traits>
template< class From, class To >
struct is_convertible;
 (depuis C++11)
Si une rvalue imaginaire de type From peut être utilisé dans l'instruction de retour d'une fonction renvoyant To, qui est, si elle peut être convertie en utilisant To implicit conversion, fournit du membre de constante égale à value true. Sinon value est false .
Original:
If an imaginary rvalue of type From can used in the return statement of a function returning To, that is, if it can be converted to To using implicit conversion, provides the member constant value equal to true. Otherwise value is false.
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Sommaire

Inherited from std::integral_constant

Member constants

value
[
statique
Original:
static
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]
true si From is convertible to To , false autrement
Original:
true if From is convertible to To , 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

Donne des résultats bien définis pour les types référence, les types, les types de tableaux vides et des types de fonction .
Original:
Gives well-defined results for reference types, void types, array types, and function types.
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[modifier] Exemple

#include <iostream>
#include <type_traits>
 
int main() 
{
    class A {};
    class B: public A {};
    class C {};
 
    bool b2a = std::is_convertible<B*, A*>::value;
    bool a2b = std::is_convertible<A*, B*>::value;
    bool b2c = std::is_convertible<B*, C*>::value;
 
    std::cout << std::boolalpha;
    std::cout << b2a << '\n';
    std::cout << a2b << '\n';
    std::cout << b2c << '\n';
}

Résultat : 

true
false
false
Récupérée de « http://fr.cppreference.com/mwiki/index.php?title=cpp/types/is_convertible&oldid=40130 »