Namespace
Varianti

std::codecvt

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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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std::codecvt
 
Elemento definito nell'header <locale>
template<

    class InternT,
    class ExternT,
    class State

> class codecvt;
Classe std::codecvt incapsula conversione di stringhe di caratteri, tra cui ampia e multibyte, da una codifica a un'altra. Tutti i file di I / O avviene attraverso std::basic_fstream<CharT> utilizzare l'aspetto std::codecvt<CharT, char, std::mbstate_t> del locale intriso nel flusso.
Original:
Class std::codecvt encapsulates conversion of character strings, including wide and multibyte, from one encoding to another. All file I/O operations performed through std::basic_fstream<CharT> use the std::codecvt<CharT, char, std::mbstate_t> facet of the locale imbued in the stream.
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cpp/locale/codecvt basecpp/locale/locale/facetstd-codecvt-inheritance.svg
Informazioni sull'immagine

Inheritance diagram

Quattro specializzazioni sono forniti dalla libreria standard e sono attuate da tutti gli oggetti delle impostazioni locali creati in un programma C + +:
Original:
Four specializations are provided by the standard library and are implemented by all locale objects created in a C++ program:
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Definizione nell'header <locale>
std::codecvt<char, char, std::mbstate_t>
identità conversione
Original:
identity conversion
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std::codecvt<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<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<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 tipi

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

[modifica] Membri oggetti

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

[modifica] Membri funzioni
costruisce un nuovo aspetto codecvt
Original:
constructs a new codecvt facet
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(metodo pubblico)
distrugge un aspetto codecvt
Original:
destructs a codecvt facet
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(protetto funzione membro)
Invoca do_out
Original:
invokes do_out
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(metodo pubblico) [modifica]
Invoca do_in
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invokes do_in
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(metodo pubblico) [modifica]
Invoca do_unshift
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invokes do_unshift
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(metodo pubblico) [modifica]
Invoca do_encoding
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invokes do_encoding
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(metodo pubblico) [modifica]
Invoca do_always_noconv
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invokes do_always_noconv
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(metodo pubblico) [modifica]
Invoca do_length
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invokes do_length
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(metodo pubblico) [modifica]
Invoca do_max_length
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invokes do_max_length
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(metodo pubblico) [modifica]

[modifica] Protetto funzioni membro

[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 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 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 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 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 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 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 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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[modifica] Esempio

Gli esempi riportati di seguito legge un UTF-8 file usando una versione locale che implementa conversione UTF-8 in codecvt <wchar_t, char, mbstate_t>
Original:
The following examples reads a UTF-8 file using a locale which implements UTF-8 conversion in codecvt<wchar_t, char, mbstate_t>
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#include <iostream>
#include <fstream>
#include <string>
#include <locale>
#include <iomanip>
int main()
{
    // UTF-8 narrow multibyte encoding
    std::ofstream("text.txt") << u8"z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
                                           // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
    std::wifstream fin("text.txt");
    fin.imbue(std::locale("en_US.UTF-8")); // this locale's codecvt<wchar_t, char, mbstate_t>
                                           // converts UTF-8 to UCS4
    std::cout << "The UTF-8 file contains the following wide characters: \n";
    for(wchar_t c; fin >> c; )
        std::cout << "U+" << std::hex << std::setw(4) << std::setfill('0') << c << '\n';
}

Output: 

The UTF-8 file contains the following wide characters:
U+007a
U+00df
U+6c34
U+1d10b

[modifica] Vedi anche

Character
conversions 		narrow multibyte
(char) 		UTF-8
(char) 		UTF-16
(char16_t)
UTF-16 mbrtoc16 / c16rtomb codecvt<char16_t, char, mbstate_t>
codecvt_utf8_utf16<char16_t>
codecvt_utf8_utf16<char32_t>
codecvt_utf8_utf16<wchar_t> 		N/A
UCS2 No codecvt_utf8<char16_t> codecvt_utf16<char16_t>
UTF-32/UCS4
(char32_t) 		mbrtoc32 / c32rtomb codecvt<char32_t, char, mbstate_t>
codecvt_utf8<char32_t> 		codecvt_utf16<char32_t>
UCS2/UCS4
(wchar_t) 		No codecvt_utf8<wchar_t> codecvt_utf16<wchar_t>
wide
(wchar_t) 		codecvt<wchar_t, char, mbstate_t>
mbsrtowcs / wcsrtombs 		No No
definisce errori di conversione dei caratteri
Original:
defines character conversion errors
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(classe template)
crea un aspetto codecvt per le impostazioni internazionali di nome
Original:
creates a codecvt facet for the named locale
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(classe template)
(C++11)
converte tra UTF-8 e UCS2/UCS4
Original:
converts between UTF-8 and UCS2/UCS4
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(classe template) [modifica]
(C++11)
converte tra UTF-16 e UCS2/UCS4
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converts between UTF-16 and UCS2/UCS4
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(classe template) [modifica]
(C++11)
 converts between UTF-8 and UTF-16
(classe template) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/locale/codecvt&oldid=26003"