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std::char_traits

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< cpp‎ | string

 
 
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
Les fonctions membres
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Member functions
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char_traits::assign
char_traits::cmp
char_traits::move
char_traits::copy
char_traits::compare
char_traits::length
char_traits::find
char_traits::to_char_type
char_traits::to_int_type
char_traits::eq_int_type
char_traits::eof
char_traits::not_eof
 
Defined in header <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_type int_type off_type pos_type state_type
char_traits<char> char int streamoff streampos mbstate_t
char_traits<wchar_t> wchar_t wint_t wstreamoff wstreampos mbstate_t
char_traits<char16_t> (C++11) char16_t int_least16_t streamoff u16streampos mbstate_t
char_traits<char32_t> (C++11) char32_t int_least32_t streamoff u32streampos mbstate_t

Sommaire

[modifier] Types de membres

Type d'
Original:
Type
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Definition
char_type CharT
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
Original:
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
Original:
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
Original:
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
Original:
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
Original:
static
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finds a character in a character sequence
(fonction membre publique statique) [edit]
[
statique
Original:
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
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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
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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
Original:
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> {
    static bool eq(char c1, char c2) {
         return std::toupper(c1) == std::toupper(c2);
     }
    static bool ne(char c1, char c2) {
         return std::toupper(c1) != std::toupper(c2);
     }
    static bool lt(char c1, char c2) {
         return std::toupper(c1) <  std::toupper(c2);
    }
    static int compare(const char* s1, const char* s2, size_t n) {
        while( n-- != 0 ) {
            if( std::toupper(*s1) < std::toupper(*s2) ) return -1;
            if( std::toupper(*s1) > std::toupper(*s2) ) return 1;
            ++s1; ++s2;
        }
        return 0;
    }
    static const char* find(const char* s, int n, char a) {
        while( n-- > 0 && std::toupper(*s) != std::toupper(a) ) {
            ++s;
        }
        return s;
    }
};
 
typedef std::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]