std::codecvt::in, std::codecvt::do_in
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<metanoindex/>
<tbody> </tbody>| Elemento definito nell'header <locale>
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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)
funzione membro pubblica, chiama la
do_in funzione membro della classe più derivata.Original:
public member function, calls the member function
do_in of the most derived class.The text has been machine-translated via Google Translate.
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2)
Se questo aspetto
codecvt definisce una conversione, traduce i caratteri esterni dalla [from, from_end) intervallo di origine ai caratteri interni, ponendo i risultati nelle posizioni successive a partire da to. Converte più di caratteri from_end - from esterni e scrive più di caratteri to_end - to interni. 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 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.The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
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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:
The text has been machine-translated via Google Translate.
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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::noconvOriginal:
The non-converting specialization
std::codecvt<char, char, std::mbstate_t> always returns std::codecvt_base::noconvThe text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
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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::mbsrtowcs, ed è quindi aggiornato per riflettere lo stato di conversione dopo l'ultimo carattere trasformato esterno, 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::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.The text has been machine-translated via Google Translate.
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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::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';
}
Output:
The string in wide encoding: zß水𝄋
Vedi anche
[virtuale] |
legge dal file associato Original: reads from the associated 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 of std::basic_filebuf membro)
|
converte una stringa di byte in una stringa di larghezza Original: converts a byte string into a wide 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) | |
converte una stringa di caratteri multibyte stretta alla stringa di larghezza, determinato stato Original: converts a narrow multibyte character string to wide 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) | |
[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 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) |