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std::mbsinit

De cppreference.com
< cpp‎ | string‎ | multibyte

 
 
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
 
Chaînes à zéro terminal multi-octets
Large / multi-octets conversions
Original:
Wide/multibyte conversions
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mbsinit
Types
Original:
Types
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mbstate_t
 
Defined in header <cwchar>
int mbsinit( const std::mbstate_t* ps);
Si ps n'est pas un pointeur NULL, la fonction mbsinit détermine si l'objet pointé à std::mbstate_t décrit l'état de conversion initial .
Original:
If ps is not a null pointer, the mbsinit function determines whether the pointed-to std::mbstate_t object describes the initial conversion state.
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Sommaire

[modifier] Notes

Bien qu'un initialisé à zéro std::mbstate_t représente toujours l'état de conversion initial, il peut y avoir d'autres valeurs de std::mbstate_t qui représentent également l'état de conversion initial .
Original:
Although a zero-initialized std::mbstate_t always represents the initial conversion state, there may be other values of std::mbstate_t that also represent the initial conversion state.
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[modifier] Paramètres

ps -
pointeur vers l'objet std :: mbstate_t à examiner
Original:
pointer to the std::mbstate_t object to examine
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[modifier] Retourne la valeur

0 si ps n'est pas un pointeur NULL et ne reporesent l'état initial de conversion, valeur différente de zéro autrement .
Original:
0 if ps is not a null pointer and does not reporesent the initial conversion state, nonzero value otherwise.
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[modifier] Exemple

#include <clocale>
#include <string>
#include <iostream>
#include <cwchar>
 
int main()
{
    // allow mbrlen() to work with UTF-8 multibyte encoding
    std::setlocale(LC_ALL, "en_US.utf8");
    // UTF-8 narrow multibyte encoding
    std::string str = u8"水"; // or u8"\u6c34" or "\xe6\xb0\xb4"
    std::mbstate_t mb = std::mbstate_t();
    (void)std::mbrlen(&str[0], 1, &mb);
    if (!std::mbsinit(&mb)) {
        std::cout << "After processing the first 1 byte of " << str
                  << " the conversion state is not initial\n";
    }
 
    (void)std::mbrlen(&str[1], str.size()-1, &mb);
    if (std::mbsinit(&mb)) {
        std::cout << "After processing the remaining 2 bytes of " << str
                  << ", the conversion state is initial conversion state\n";
    }
}

Résultat :

After processing the first 1 byte of 水 the conversion state is not initial
After processing the remaining 2 bytes of 水, the conversion state is initial conversion state

[modifier] Voir aussi

informations sur l'état de conversion nécessaire pour parcourir les chaînes de caractères multi-octets
Original:
conversion state information necessary to iterate multibyte character strings
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(classe) [edit]
C documentation for mbsinit