std::codecvt::out, std::codecvt::do_out

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C++

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Localizzazione

Espressioni regolari (C++11)

Operazioni atomicche (C++11)

Multithreading (C++11)

 

Localizzazioni libreria

Impostazioni internazionali e sfaccettature Original: Locales and facets The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
locale
use_facet	has_facet
Carattere classificazione Original: Character classification The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
isspace isblank (C++11) iscntrl isupper islower isalpha	isdigit ispunct isxdigit isalnum isprint isgraph
Conversioni Original: Conversions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
toupper tolower	wstring_convert (C++11) wbuffer_convert (C++11)
Facet categoria classi di base Original: Facet category base classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ctype_base codecvt_base messages_base	time_base money_base
Facet categorie Original: Facet categories The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ctype ctype<char> codecvt collate messages time_get time_put	num_get num_put numpunct money_get money_put moneypunct
Locale specifici aspetti Original: Locale-specific facets The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ctype_byname ctype_byname<char> codecvt_byname messages_byname collate_byname	time_get_byname time_put_byname numpunct_byname moneypunct_byname
Codice di conversione sfaccettature Original: Code conversion facets The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
codecvt_utf8 (C++11) codecvt_utf16 (C++11)	codecvt_utf8_utf16 (C++11) codecvt_mode (C++11)
C locale Original: C locale The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setlocale localeconv lconv	LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY LC_NUMERIC LC_TIME

 

std::codecvt

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

codecvt::codecvt

codecvt::~codecvt

codecvt::out codecvt::do_out

codecvt::in codecvt::do_in

codecvt::unshift codecvt::do_unshift

codecvt::encoding codecvt::do_encoding

codecvt::always_noconv codecvt::do_always_noconv

codecvt::length codecvt::do_length

codecvt::max_length codecvt::do_max_length

 

<tbody> </tbody>

Elemento definito nell'header <locale>
public: result out( stateT& state, const internT* from, const internT* from_end, const internT*& from_next, externT* to, externT* to_end, externT*& to_next ) const;	(1)
protected: result do_out( stateT& state, const internT* from, const internT* from_end, const internT*& from_next, externT* to, externT* to_end, externT*& to_next ) const;	(2)

1)

funzione membro pubblica, chiama la do_out funzione membro della classe più derivata.

Original:

public member function, calls the member function do_out of the most derived class.

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2)

Se questo aspetto codecvt definisce una conversione, traduce i caratteri interni della [from, from_end) intervallo di origine a caratteri esterni, mettendo i risultati nelle posizioni successive a partire da to. Converte più di caratteri from_end - from interni e scrive più di caratteri to_end - to esterni. Foglie from_next e to_next indicando uno oltre l'ultimo elemento convertito con successo.

Original:

If this codecvt facet defines a conversion, translates the internal characters from the source range [from, from_end) to external characters, placing the results in the subsequent locations starting at to. Converts no more than from_end - from internal characters and writes no more than to_end - to external characters. Leaves from_next and to_next pointing one beyond the last element successfully converted.

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Se questo aspetto codecvt non definisce una conversione, non i caratteri vengono convertiti. to_next è impostato per essere uguale a to, state è immutato, e std::codecvt_base::noconv viene restituito.

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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Valore di ritorno

Un valore di std::codecvt_base::result tipo, che indica lo stato di successo come segue:

Original:

A value of type std::codecvt_base::result, indicating the success status as follows:

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ok	conversione completata Original: conversion completed The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
partial	abbastanza spazio nel buffer di uscita o inaspettata fine del buffer di origine Original: not enough space in the output buffer or unexpected end of source buffer The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
error	incontrato un personaggio che non può essere convertito Original: encountered a character that could not be converted The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
noconv	questo aspetto non è di conversione, nessuna uscita scritta Original: this facet is non-converting, no output written The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

La specializzazione non convertire std::codecvt<char, char, std::mbstate_t> restituisce sempre 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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Note

Richiede che from <= from_end && to <= to_end e che state o rappresentare lo stato iniziale del cambio o ottenuti convertendo i caratteri precedenti nella sequenza.

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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Mentre codecvt supporta N: M conversioni (ad esempio UTF-16 a UTF-8, in cui due personaggi interni potrebbe essere necessario decidere ciò che i caratteri esterni di uscita), std::basic_filebuf possibile utilizzare solo gli aspetti che definiscono un codecvt 1: conversione di N, che è deve essere in grado di elaborare un carattere interno alla volta quando si scrive in un file.

Original:

While codecvt supports N:M conversions (e.g. UTF-16 to UTF-8, where two internal characters may be necessary to decide what external characters to output), std::basic_filebuf can only use codecvt facets that define a 1:N conversion, that is it must be able to process one internal character at a time when writing to a file.

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Durante l'esecuzione di N: M conversioni, questa funzione può restituire std::codecvt_base::partial dopo aver consumato tutti i caratteri di origine (). Ciò significa che un altro carattere interno è necessario per completare la conversione (ad esempio quando la conversione UTF-16 a UTF-8, se l'ultimo carattere del buffer di origine è un surrogato alto).

Original:

When performing N:M conversions, this function may return std::codecvt_base::partial after consuming all source characters (). This means that another internal character is needed to complete the conversion (e.g. when converting UTF-16 to UTF-8, if the last character in the source buffer is a high surrogate).

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L'effetto sulla state è volutamente non specificato. In sfaccettature standard, viene utilizzato per mantenere lo stato di spostamento, come quando si chiama std::wcsrtombs, ed è quindi aggiornato per riflettere lo stato del cambio dopo l'ultimo carattere convertito con successo, ma un aspetto definito dall'utente è libero di usarlo per mantenere qualsiasi altro stato, ad esempio, contare il numero di caratteri speciali incontrate.

Original:

The effect on state is deliberately unspecified. In standard facets, it is used to maintain shift state like when calling std::wcsrtombs, and is therefore updated to reflect the shift state after the last successfully converted 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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Esempio

#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::wstring internal = L"z\u00df\u6c34\U0001d10b"; // L"zß水𝄋"

    // note that the following can be done with wstring_convert
    std::mbstate_t mb = std::mbstate_t(); // initial shift state
    std::string external(internal.size() * f.max_length(), '\0'); 
    const wchar_t* from_next;
    char* to_next;
    f.out(mb, &internal[0], &internal[internal.size()], from_next,
              &external[0], &external[external.size()], to_next);
    // error checking skipped for brevity
    external.resize(to_next - &external[0]);

    std::cout << "The string in narrow multibyte encoding: " << external << '\n';
}

Output:

The string in narrow multibyte encoding: zß水𝄋

Vedi anche

overflow [virtuale]	scrive i caratteri nel file associato dalla zona put Original: writes characters to the associated file from the put area The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtuale protetto funzione of std::basic_filebuf membro)
to_bytes	converte una stringa larga in una stringa di byte Original: converts a wide string into a byte string The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
wcsrtombs	converte una stringa larga a stretta stringa a caratteri multibyte, determinato stato Original: converts a wide string to narrow multibyte character string, given state The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione)
do_in [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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtuale protetto funzione membro)