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      std::is_polymorphic

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      < cpp‎ | types

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      C++
       
      Bibliothèque d'utilitaires
       
      Soutien aux types fondamentaux
      Les types de base
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      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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      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)
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      is_compound (C++11)
      is_integral (C++11)
      is_floating_point (C++11)
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      is_member_pointer (C++11)
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      Les propriétés du type
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      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
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      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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      alignment_of (C++11)
      rank (C++11)
      extent (C++11)
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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)
       
      Déclaré dans l'en-tête <type_traits>
      template<class T >
      struct is_polymorphic;
      		 (depuis C++11)
      Si T est une classe polymorphe (c'est à dire une classe qui hérite déclare ou au moins une fonction virtuelle), fournit du membre de constante valuetrue égale. Pour tout autre type, value est false .
      Original:
      If T is a polymorphic class (that is, a class that declares or inherits at least one virtual function), provides the member constant value equal true. For any other type, 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 T is a polymorphic class type , false autrement
      Original:
      true if T is a polymorphic class 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_typebool
      typestd::integral_constant<bool, value>

      [modifier]Notes

      Seules les classes polymorphes contiennent caché des informations RTTI qui permet d'examiner et de les convertir avec dynamic_cast .
      Original:
      Only polymorphic classes contain hidden RTTI information which makes it possible to examine and convert them with dynamic_cast.
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      [modifier]Exemple

      #include <iostream>#include <type_traits>   struct A {int m;};   struct B {virtualvoid foo();};   struct C : B {};   int main(){std::cout<<std::boolalpha;std::cout<< std::is_polymorphic<A>::value<<'\n';std::cout<< std::is_polymorphic<B>::value<<'\n';std::cout<< std::is_polymorphic<C>::value<<'\n';}

      Résultat : 

      false true true

      [modifier]Voir aussi

      (C++11)
      		 checks if a type is a class type (but not union type)
      (classe générique)[edit]
      (C++11)
      vérifie si un type est le type de classe abstraite
      Original:
      checks if a type is abstract class type
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      (classe générique)[edit]
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/types/is_polymorphic&oldid=49609 »
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