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      std::remove_cv, std::remove_const, std::remove_volatile

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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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      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)
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      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
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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)
      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)
       
      Déclaré dans l'en-tête <type_traits>
      template<class T >
      struct remove_cv;
      		 (1) (depuis C++11)
      template<class T >
      struct remove_const;
      		 (2) (depuis C++11)
      template<class T >
      struct remove_volatile;
      		 (3) (depuis C++11)

      Provides the member typedef type which is the same as T, except that its topmost cv-qualifiers are removed.

      1) removes the topmost const, the topmost volatile, or both, if present.

      2) removes the topmost const

      3) removes the topmost volatile

      Sommaire

      [modifier]Types de membres

      Nom
      Original:
      Name
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      		 Definition
      type the type T without cv-qualifier

      [modifier]Mise en œuvre possible

      template<class T >struct remove_cv {typedeftypename std::remove_volatile<typename std::remove_const<T>::type>::type type;};   template<class T >struct remove_const {typedef T type;};template<class T >struct remove_const<const T>{typedef T type;};   template<class T >struct remove_volatile {typedef T type;};template<class T >struct remove_volatile<volatile T>{typedef T type;};

      [modifier]Exemple

      Removing const/volatile from constvolatileint* does not modify the type, because the pointer itself is neither const nor volatile. 

      #include <iostream>#include <type_traits>   int main(){typedef std::remove_cv<constint>::type type1;typedef std::remove_cv<volatileint>::type type2;typedef std::remove_cv<constvolatileint>::type type3;typedef std::remove_cv<constvolatileint*>::type type4;typedef std::remove_cv<int*constvolatile>::type type5;   std::cout<<"test1 "<<(std::is_same<int, type1>::value?"passed":"failed")<<'\n';std::cout<<"test2 "<<(std::is_same<int, type2>::value?"passed":"failed")<<'\n';std::cout<<"test3 "<<(std::is_same<int, type3>::value?"passed":"failed")<<'\n';std::cout<<"test4 "<<(std::is_same<constvolatileint*, type4>::value?"passed":"failed")<<'\n';std::cout<<"test5 "<<(std::is_same<int*, type5>::value?"passed":"failed")<<'\n';}

      Résultat : 

      test1 passed test2 passed test3 passed test4 passed test5 passed

      [modifier]Voir aussi

      (C++11)
      vérifie si un type est const qualifié
      Original:
      checks if a type is const-qualified
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      (classe générique)[edit]
      (C++11)
      vérifie si un type est volatile qualifié
      Original:
      checks if a type is volatile-qualified
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      (classe générique)[edit]
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/types/remove_cv&oldid=49665 »
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