Namespace
Varianti

std::codecvt_byname

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< cpp‎ | locale

 
 
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
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Conversions
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Facet categoria classi di base
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Facet category base classes
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Facet categorie
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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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Defined in 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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Defined in 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)
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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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Indice

[modifica] Membri funzioni

costruisce un nuovo aspetto codecvt_byname
Original:
constructs a new codecvt_byname facet
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(membro pubblico funzione)
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
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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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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_in
Original:
invokes do_in
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_unshift
Original:
invokes do_unshift
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_encoding
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invokes do_encoding
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_always_noconv
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invokes do_always_noconv
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_length
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invokes do_length
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_max_length
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invokes do_max_length
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(membro pubblico of std::codecvt funzione) [edit]

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) [edit]
[virtuale]
converte una stringa da externT a internt, come ad esempio durante la lettura dal file
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converts a string from externT to internT, such as when reading from file
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(virtuale protetto funzione of std::codecvt membro) [edit]
[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) [edit]
[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) [edit]
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) [edit]
[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) [edit]
[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) [edit]


Inherited from std::codecvt_base

Membro tipo
Original:
Member type
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Definition
enum result { ok, partial, error, noconv };
Enumerazione senza ambito
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Unscoped enumeration type
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Enumerazione costante
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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
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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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[modifica] 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

[modifica] 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) [edit]