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    std::codecvt_byname

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    <metanoindex/>

     
    C++
     
    Localizzazioni libreria
    Impostazioni internazionali e sfaccettature
    Original:
    Locales and facets
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    locale
    Carattere classificazione
    Original:
    Character classification
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    Conversioni
    Original:
    Conversions
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    Facet categoria classi di base
    Original:
    Facet category base classes
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    Facet categorie
    Original:
    Facet categories
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    Locale specifici aspetti
    Original:
    Locale-specific facets
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    Codice di conversione sfaccettature
    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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    <tbody> </tbody>
    Elemento definito nell'header <locale>
    template< class internT, class externT, class stateT > class codecvt_byname : public std::codecvt<internT, externT, stateT>;
    std::codecvt_byname è un aspetto std::codecvt che incapsula multibyte / gamma regole carattere di conversione di un locale di cui alla sua costruzione.
    Original:
    std::codecvt_byname is a std::codecvt facet which encapsulates multibyte/wide character conversion rules of a locale specified at its construction.
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    Quattro specializzazioni sono forniti dalla libreria standard
    Original:
    Four specializations are provided by the standard library
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    Definizione nell'header <locale>
    std::codecvt_byname<char, char, std::mbstate_t>
    identità conversione
    Original:
    identity conversion
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    std::codecvt_byname<char16_t, char, std::mbstate_t>
    conversione tra UTF-16 e UTF-8 (dal C++11)
    Original:
    conversion between UTF-16 and UTF-8 (dal C++11)
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    std::codecvt_byname<char32_t, char, std::mbstate_t>
    conversione tra UTF-32 e UTF-8 (dal C++11)
    Original:
    conversion between UTF-32 and UTF-8 (dal C++11)
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    std::codecvt_byname<wchar_t, char, std::mbstate_t>
    specifica delle impostazioni internazionali conversione tra stringa larga e stretta, eventualmente multibyte, stringa
    Original:
    locale-specific conversion between wide string and narrow, possibly multibyte, string
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    Membri funzioni
    costruisce un nuovo aspetto codecvt_byname
    Original:
    constructs a new codecvt_byname facet
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    (metodo pubblico)
    distrugge un aspetto codecvt_byname
    Original:
    destructs a codecvt_byname facet
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    (protetto funzione membro)

    Inherited from std::codecvt

    Member types

    Membro tipo
    Original:
    Member type
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    		 Definition
    intern_type internT
    extern_type externT
    state_type stateT

    Member objects

    Persona
    Original:
    Member name
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    		 Type
    id (statico) std::locale::id

    Member functions
    Invoca do_out
    Original:
    invokes do_out
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    (metodo pubblico) [modifica]
    Invoca do_in
    Original:
    invokes do_in
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    (metodo pubblico) [modifica]
    Invoca do_unshift
    Original:
    invokes do_unshift
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    (metodo pubblico) [modifica]
    Invoca do_encoding
    Original:
    invokes do_encoding
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    (metodo pubblico) [modifica]
    Invoca do_always_noconv
    Original:
    invokes do_always_noconv
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    (metodo pubblico) [modifica]
    Invoca do_length
    Original:
    invokes do_length
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    (metodo pubblico) [modifica]
    Invoca do_max_length
    Original:
    invokes do_max_length
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    (metodo pubblico) [modifica]

    Protected member functions

    [virtuale]
    converte una stringa da internt a externT, come ad esempio durante la scrittura su file
    Original:
    converts a string from internT to externT, such as when writing to file
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    (virtuale protetto funzione of std::codecvt membro) [modifica]
    [virtuale]
    converte una stringa da externT a internt, come ad esempio durante la lettura dal file
    Original:
    converts a string from externT to internT, such as when reading from file
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    (virtuale protetto funzione of std::codecvt membro) [modifica]
    [virtuale]
    genera la sequenza di caratteri di terminazione di caratteri externT per la conversione incompleta
    Original:
    generates the termination character sequence of externT characters for incomplete conversion
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    (virtuale protetto funzione of std::codecvt membro) [modifica]
    [virtuale]
    restituisce il numero di caratteri externT necessari a produrre un carattere internt, se costante
    Original:
    returns the number of externT characters necessary to produce one internT character, if constant
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    (virtuale protetto funzione of std::codecvt membro) [modifica]
    [virtuale]
    Verifica se la faccetta codifica una conversione di identità per tutti i valori degli argomenti validi
    Original:
    tests if the facet encodes an identity conversion for all valid argument values
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    (virtuale protetto funzione of std::codecvt membro) [modifica]
    [virtuale]
    calcola la lunghezza della stringa externT che sarebbe consumata dalla conversione in tampone internt dato
    Original:
    calculates the length of the externT string that would be consumed by conversion into given internT buffer
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    (virtuale protetto funzione of std::codecvt membro) [modifica]
    [virtuale]
    restituisce il numero massimo di caratteri externT che può essere convertito in un singolo carattere internt
    Original:
    returns the maximum number of externT characters that could be converted into a single internT character
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    (virtuale protetto funzione of std::codecvt membro) [modifica]


    Inherited from std::codecvt_base

    Membro tipo
    Original:
    Member type
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    		 Definition
    enum result { ok, partial, error, noconv };
    Enumerazione senza ambito
    Original:
    Unscoped enumeration type
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    Enumerazione costante
    Original:
    Enumeration constant
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    		 Definition
    ok
    conversione è stata completata senza errori
    Original:
    conversion was completed with no error
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    partial
    non tutti i caratteri di origine sono stati convertiti
    Original:
    not all source characters were converted
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    error
    rilevato un carattere non valido
    Original:
    encountered an invalid character
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    noconv
    non essere effettuata la conversione, di ingresso e di tipi di output sono gli stessi
    Original:
    no conversion required, input and output types are the same
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    Esempio

    Questo esempio mostra la lettura di un file con codifica GB18030 utilizzando il facet codecvt da un GB18030-aware locale
    Original:
    This example demonstrates reading a GB18030-encoded file using the codecvt facet from a GB18030-aware locale
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    #include <iostream>
#include <fstream>
#include <string>
#include <locale>
int main()
{
    // GB18030 narrow multibyte encoding
    std::ofstream("text.txt") << "\x7a"              // letter 'z', U+007a
                                 "\x81\x30\x89\x38"  // letter 'ß', U+00df
                                 "\xcb\xae"          // CJK ideogram '水' (water), U+6c34
                                 "\x94\x32\xbc\x35"; // musical sign '𝄋' (segno), U+1d10b
    std::wifstream fin("text.txt");
    fin.imbue(std::locale(fin.getloc(),
              new std::codecvt_byname<wchar_t, char, std::mbstate_t>("zh_CN.gb18030")));
    for(wchar_t c; fin.get(c); )
        std::cout << std::hex << std::showbase << c << '\n';
}

    Output: 

    0x7a
0xdf
0x6c34
0x1d10b

    Vedi anche
    converte tra codifiche dei caratteri, tra cui UTF-8, UTF-16, UTF-32
    Original:
    converts between character encodings, including UTF-8, UTF-16, UTF-32
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    (classe template) [modifica]