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std::codecvt::encoding, std::codecvt::do_encoding

De cppreference.com
< cpp‎ | locale‎ | codecvt

 
 
Bibliothèque localisations
Locales et facettes
Original:
Locales and facets
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locale
Classification des caractères
Original:
Character classification
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Conversions
Original:
Conversions
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Classes de facettes catégorie de base
Original:
Facet category base classes
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Catégories de facettes
Original:
Facet categories
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Spécifique aux paramètres régionaux facettes
Original:
Locale-specific facets
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Facettes de conversion de code
Original:
Code conversion facets
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codecvt_utf8 (C++11)
codecvt_utf16 (C++11)
C locale
Original:
C locale
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Defined in header <locale>
public:
int encoding() const
(1)
protected:
int do_encoding() const
(2)
1)
fonction de membre du public, appelle le do_encoding fonction membre de la classe la plus dérivée .
Original:
public member function, calls the member function do_encoding of the most derived class.
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2)
si le codage représenté par cette facette codecvt mappe chaque caractère interne de la même, le nombre de caractères externes constant, le rendement de ce nombre. Si le codage est de longueur variable (par exemple UTF-8 ou UTF-16), retourne 0. Si le codage est dépendant de l'état, -1 retour .
Original:
if the encoding represented by this codecvt facet maps each internal character to the same, constant number of external characters, returns that number. If the encoding is variable-length (e.g. UTF-8 or UTF-16), returns 0. If the encoding is state-dependent, returns -1.
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Sommaire

[modifier] Retourne la valeur

Le nombre exact de caractères externT qui correspondent à un caractère internT, s'il est constant. 0 si le nombre varie, -1 si l'encodage est dépendant de l'état .
Original:
The exact number of externT characters that correspond to one internT character, if constant. 0 if the number varies, -1 if the encoding is state-dependent.
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La spécialisation non-conversion std::codecvt<char, char, std::mbstate_t> retours 1
Original:
The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns 1
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[modifier] Exceptions

noexcept specification:  
noexcept
   (depuis C++11)

[modifier] Exemple

#include <locale>
#include <iostream>
int main()
{
    std::cout << "en_US.utf8 is a variable-length encoding, encoding() returns "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("en_US.utf8")
              ).encoding() << '\n';
 
    std::cout << "zh_CN.gb18030 is also variable-length, encoding() == "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("zh_CN.gb18030")
              ).encoding() << '\n';
 
    std::cout << "ru_RU.koi8r is a single-byte encoding encoding() == "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("ru_RU.koi8r")
              ).encoding() << '\n';
}

Résultat :

en_US.utf8 is a variable-length encoding, encoding() returns 0
zh_CN.gb18030 is also variable-length, encoding() == 0
ru_RU.koi8r is a single-byte encoding encoding() == 1

[modifier] Voir aussi

MB_CUR_MAX
nombre maximal d'octets dans un caractère multi-octets dans le courant C locale
(
variable de macro
Original:
macro variable
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)
Original:
maximum number of bytes in a multibyte character in the current C locale
(
variable de macro
Original:
macro variable
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)
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[edit]
[
virtuel
Original:
virtual
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]
retourne le nombre de caractères maximum Externt qui pourraient être transformés en un seul caractère Internt
Original:
returns the maximum number of externT characters that could be converted into a single internT character
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(fonction membre virtuelle protégée) [edit]