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std::codecvt::in, std::codecvt::do_in

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< 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:

result in( stateT& state,
           const externT* from,
           const externT* from_end,
           const externT*& from_next,
           internT* to,
           internT* to_end,

           internT*& to_next ) const;
(1)
protected:

result do_in( stateT& state,
              const externT* from,
              const externT* from_end,
              const externT*& from_next,
              internT* to,
              internT* to_end,

              internT*& to_next ) const;
(2)
1)
fonction de membre du public, appelle le do_in fonction membre de la classe la plus dérivée .
Original:
public member function, calls the member function do_in of the most derived class.
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2)
Si cette facette codecvt définit une conversion, convertit les caractères extérieurs de la plage source [from, from_end) de caractères internes, placer les résultats dans les emplacements suivants à partir de to. Convertit pas plus de caractères from_end - from externes et écrit plus de caractères to_end - to internes. Feuilles from_next et to_next pointant un au-delà du dernier élément a réussi à convertir .
Original:
If this codecvt facet defines a conversion, translates the external characters from the source range [from, from_end) to internal characters, placing the results in the subsequent locations starting at to. Converts no more than from_end - from external characters and writes no more than to_end - to internal characters. Leaves from_next and to_next pointing one beyond the last element successfully converted.
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Si cette facette codecvt ne définit pas une conversion, pas de caractères sont converties. to_next est réglée pour être égale à to, state est inchangé, et est retourné std::codecvt_base::noconv .
Original:
If this codecvt facet does not define a conversion, no characters are converted. to_next is set to be equal to to, state is unchanged, and std::codecvt_base::noconv is returned.
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Sommaire

[modifier] Retourne la valeur

Une valeur de std::codecvt_base::result type, qui indique l'état de réussite comme suit:
Original:
A value of type std::codecvt_base::result, indicating the success status as follows:
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ok
conversion terminée
Original:
conversion completed
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partial
pas assez d'espace dans la mémoire tampon de sortie ou à la fin inattendue du tampon source
Original:
not enough space in the output buffer or unexpected end of source buffer
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error
rencontré un personnage qui n'a pas pu être convertie
Original:
encountered a character that could not be converted
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noconv
cette facette est non-conversion, aucune sortie écrite
Original:
this facet is non-converting, no output written
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La spécialisation non-conversion std::codecvt<char, char, std::mbstate_t> renvoie toujours std::codecvt_base::noconv
Original:
The non-converting specialization std::codecvt<char, char, std::mbstate_t> always returns std::codecvt_base::noconv
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[modifier] Notes

Exige que from <= from_end && to <= to_end et qui supporte state représentant l'état initial ou obtenues en convertissant les caractères précédents dans la séquence .
Original:
Requires that from <= from_end && to <= to_end and that state either representing the initial shift state or obtained by converting the preceding characters in the sequence.
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L'effet sur state est délibérément non précisée. Dans facettes standards, il est utilisé pour maintenir un état de décalage, comme lors de l'appel std::mbsrtowcs, et est donc mis à jour pour refléter l'état de conversion après le dernier caractère externe de traitement, mais une facette définie par l'utilisateur est libre de l'utiliser pour maintenir n'importe quel autre état, par exemple, compter le nombre de caractères spéciaux rencontrés .
Original:
The effect on state is deliberately unspecified. In standard facets, it is used to maintain shift state like when calling std::mbsrtowcs, and is therefore updated to reflect the conversion state after the last processed external character, but a user-defined facet is free to use it to maintain any other state, e.g. count the number of special characters encountered.
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[modifier] Exemple

#include <iostream>
#include <string>
#include <locale>
int main()
{
    std::locale::global(std::locale("en_US.utf8"));
    auto& f = std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(std::locale());
    std::string external = u8"z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
                          // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
 
    // note that the following can be done with wstring_convert
    std::mbstate_t mb = std::mbstate_t(); // initial shift state
    std::wstring internal(external.size(), '\0'); 
    const char* from_next;
    wchar_t* to_next;
    f.in(mb, &external[0], &external[external.size()], from_next,
             &internal[0], &internal[internal.size()], to_next);
    // error checking skipped for brevity
    internal.resize(to_next - &internal[0]);
 
    std::wcout << L"The string in wide encoding: " << internal << '\n';
}

Résultat :

The string in wide encoding: zß水𝄋

[modifier] Voir aussi

[
virtuel
Original:
virtual
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]
lit le fichier associé
Original:
reads from the associated file
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(fonction membre virtuelle protégée de std::basic_filebuf) [edit]
convertit une chaîne d'octets en une chaîne large
Original:
converts a byte string into a wide string
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(fonction membre publique de std::wstring_convert) [edit]
convertit une chaîne de caractères multi-octets en une chaîne de caractère étroit de large, état donné
Original:
converts a narrow multibyte character string to wide string, given state
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(fonction) [edit]
[
virtuel
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virtual
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]
convertit une chaîne de Internt à Externt, comme lors de l'écriture dans un fichier
Original:
converts a string from internT to externT, such as when writing to file
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(fonction membre virtuelle protégée) [edit]