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      std::char_traits

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      < cpp‎ | string

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      C++
       
      Bibliothèque de chaînes de caractères
      Chaînes à zéro terminal
      Original:
      Null-terminated strings
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      Les chaînes d'octets
      Chaines multi-octets
      Les chaînes étendues
      Classes
      Original:
      Classes
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      basic_string
      char_traits
       
      std::char_traits
       
      Déclaré dans l'en-tête <string>
      template<

          class CharT

      >class char_traits;
      La classe char_traits définit le flux et les propriétés de fonctionnement d'une chaîne de type caractère, comme des types utilisés pour manipuler les caractères et chaînes de caractères, ainsi que toutes les opérations des communes pour le type de caractère donné .
      Original:
      The char_traits class defines the stream and string operation properties of a character type, such as the types used for manipulating the characters and character strings, as well as all the common operations for the given character type.
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      Il est défini char_traits modèle de classe, qui sert de base pour les instanciations explicites. Elle répond à toutes les exigences du concept de Traits .
      Original:
      There is class template char_traits defined, which serves as a basis for explicit instantiations. It fulfills all requirements of Traits concept.
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      En outre, plusieurs spécialisations sont définies pour la plupart des types de caractères communs qui qui doit spécifier les membres suivants:
      Original:
      Also, several specializations are defined for most common character types which which has to specify the following members:
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      Instantiation char_typeint_typeoff_typepos_typestate_type
      char_traits<char>charintstreamoffstreamposmbstate_t
      char_traits<wchar_t>wchar_twint_twstreamoffwstreamposmbstate_t
      char_traits<char16_t> (C++11)char16_tint_least16_tstreamoffu16streamposmbstate_t
      char_traits<char32_t> (C++11)char32_tint_least32_tstreamoffu32streamposmbstate_t
      This section is incomplete
      Reason: simplify the description, emphasize that char_traits can be user defined

      Sommaire

      [modifier]Types de membres

      Type d'
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      Type
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      		 Definition
      char_typeCharT
      int_type
      un type entier qui peut contenir toutes les valeurs de char_type ainsi EOF
      Original:
      an integer type that can hold all values of char_type plus EOF
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      off_type
      ' Définie par l'implémentation
      Original:
      implementation-defined
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      pos_type
      ' Définie par l'implémentation
      Original:
      implementation-defined
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      state_type
      ' Définie par l'implémentation
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      implementation-defined
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      [modifier]Fonctions membres

      [
      statique
      Original:
      static
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      ]
      attribue un caractère
      Original:
      assigns a character
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      (fonction membre publique statique)[edit]
      [
      statique
      Original:
      static
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      ]
      compare deux caractères
      Original:
      compares two characters
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      (fonction membre publique statique)[edit]
      [
      statique
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      static
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      ]
      une séquence de caractères se déplace sur une autre
      Original:
      moves one character sequence onto another
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      (fonction membre publique statique)[edit]
      [
      statique
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      static
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      ]
      copie d'une séquence de caractères
      Original:
      copies a character sequence
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      (fonction membre publique statique)[edit]
      [
      statique
      Original:
      static
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      ]
      compare lexicographiquement deux séquences de caractères
      Original:
      lexicographically compares two character sequences
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      (fonction membre publique statique)[edit]
      [
      statique
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      static
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      ]
      renvoie la longueur d'une séquence de caractères
      Original:
      returns the length of a character sequence
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      (fonction membre publique statique)[edit]
      [
      statique
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      static
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      ]
      		 finds a character in a character sequence
      (fonction membre publique statique)[edit]
      [
      statique
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      static
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      ]
      convertit int_type à char_type équivalent
      Original:
      converts int_type to equivalent char_type
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      (fonction membre publique statique)[edit]
      [
      statique
      Original:
      static
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      ]
      convertit char_type à int_type équivalent
      Original:
      converts char_type to equivalent int_type
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      (fonction membre publique statique)[edit]
      [
      statique
      Original:
      static
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      ]
      compare deux valeurs int_type
      Original:
      compares two int_type values
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      (fonction membre publique statique)[edit]
      [
      statique
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      static
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      ]
      retourne un' eof valeur
      Original:
      returns an eof value
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      (fonction membre publique statique)[edit]
      [
      statique
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      static
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      ]
      vérifie si un caractère est' eof valeur
      Original:
      checks whether a character is eof value
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      (fonction membre publique statique)[edit]

      [modifier]Exemple

      Traits de caractère définies par l'utilisateur peuvent être utilisés pour fournir case-insensitive comparison
      Original:
      User-defined character traits may be used to provide case-insensitive comparison
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      #include <string>#include <iostream>#include <cctype>   struct ci_char_traits :public std::char_traits<char>{staticbool eq(char c1, char c2){returnstd::toupper(c1)==std::toupper(c2);}staticbool ne(char c1, char c2){returnstd::toupper(c1)!=std::toupper(c2);}staticbool lt(char c1, char c2){returnstd::toupper(c1)<std::toupper(c2);}staticint compare(constchar* s1, constchar* s2, size_t n){while( n--!=0){if(std::toupper(*s1)<std::toupper(*s2))return-1;if(std::toupper(*s1)>std::toupper(*s2))return1;++s1;++s2;}return0;}staticconstchar* find(constchar* s, int n, char a){while( n-->0&&std::toupper(*s)!=std::toupper(a)){++s;}return s;}};   typedefstd::basic_string<char, ci_char_traits> ci_string;   std::ostream& operator<<(std::ostream& os, const ci_string& str){return os.write(str.data(), str.size());}   int main(){ ci_string s1 ="Hello"; ci_string s2 ="heLLo";if(s1 == s2)std::cout<< s1 <<" and "<< s2 <<" are equal\n";}

      Résultat : 

      Hello and heLLo are equal

      [modifier]Voir aussi

      magasins et manipule des séquences de caractères
      Original:
      stores and manipulates sequences of characters
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      (classe générique)[edit]
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/string/char_traits&oldid=49342 »
      close