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      NULL

      De cppreference.com
      < cpp‎ | types

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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)
      nullptr_t (C++11)
      offsetof
      NULL
      Limites numériques
      Original:
      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
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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 <cstddef>
      Déclaré dans l'en-tête <cstring>
      Déclaré dans l'en-tête <cwchar>
      Déclaré dans l'en-tête <ctime>
      Déclaré dans l'en-tête <clocale>
      Déclaré dans l'en-tête <cstdio>
      #define NULL /*implementation-defined*/
      Définit la constante de pointeur NULL, ce qui est un prvalue expression intégrale de constante de type entier qui évalue à zéro ou un prvalue de std::nullptr_t type. Le pointeur null constante peut être implicitement convertie à tout type pointeur, les résultats transformation sur la valeur de pointeur null de ce type. Si la constante de pointeur nul est de type entier, il peut être converti en un type de prvalue de std::nullptr_t .
      Original:
      Defines the null pointer constant, which is an integral constant expression prvalue of integer type that evaluates to zero or a prvalue of type std::nullptr_t. The null pointer constant may be implicitement convertie to any pointer type; such conversion results in the null pointer value of that type. If the null pointer constant has integer type, it may be converted to a prvalue of type std::nullptr_t.
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      [modifier]Mise en œuvre possible

      #define NULL 0//since C++11#define NULL nullptr

      [modifier]Exemple

      #include <cstddef>class S;int main(){int* p = NULL;int* p2 =static_cast<std::nullptr_t>(NULL);void(*f)(int)= NULL;int S::*mp = NULL;void(S::*mfp)(int)= NULL;}


      [modifier]Voir aussi

      nullptr
      le pointeur littéral qui spécifie un pointeur NULL (C++11) valeur
      Original:
      the pointer literal which specifies a null pointer value (C++11)
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      [edit]
      (C++11)
      le type de la nullptr pointeur null littéral
      Original:
      the type of the null pointer literal nullptr
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      (typedef)[edit]
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/types/NULL&oldid=49557 »
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