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      std::integral_constant

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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)
      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
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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, T v >
      struct integral_constant;
      		 (depuis C++11)
      std::integral_constant encapsule une constante statique du type spécifié. Il s'agit de la classe de base pour les caractères de C + + .
      Original:
      std::integral_constant wraps a static constant of specified type. It is the base class for the C++ type traits.
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      Deux spécialisations pour la bool type sont fournis:
      Original:
      Two specializations for the type bool are provided:
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      Defined in header <type_traits>
      Type d'
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      Type
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      		 Definition
      true_typestd::integral_constant<bool, true>
      false_typestd::integral_constant<bool, false>

      Sommaire

      [modifier]Types de membres

      Type d'
      Original:
      Type
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      		 Definition
      value_typeT
      typestd::integral_constant<T,v>

      [modifier]Constantes membres

      Nom
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      Name
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      		 Value
      value
      statique expression constante de type avec Tv valeur
      Original:
      static constant expression of type T with value v
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      [modifier]Fonctions membres

      operator value_type
      convertit l'objet en value_type, retourne value
      Original:
      converts the object to value_type, returns value
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      (fonction membre publique)

      [modifier]Mise en œuvre possible

      template<class T, T v>struct integral_constant {staticconstexpr T value = v;typedef T value_type;typedef integral_constant type;constexpr operator value_type()const{return value;}};

      [modifier]Exemple

      #include <iostream>#include <type_traits>   int main(){typedef std::integral_constant<int, 2> two_t;typedef std::integral_constant<int, 4> four_t;   // static_assert(std::is_same<two_t, four_t>::value,// "two_t and four_t are not equal!"); // error: static assertion failed: "two_t and four_t are not a same types"   static_assert(two_t::value*2== four_t::value, "2*2 != 4");   enumclass my_e { e1, e2 };typedef std::integral_constant<my_e, my_e::e1> my_e_e1;typedef std::integral_constant<my_e, my_e::e2> my_e_e2;   // static_assert(my_e_e1::value == my_e::e2,// "my_e_e1::value != my_e::e2");// error: static assertion failed: "my_e_e1::value != my_e::e2"   static_assert(std::is_same<my_e_e2, my_e_e2>::value, "my_e_e2 != my_e_e2");}


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