std::codecvt::in, std::codecvt::do_in
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| Definido en el archivo de encabezado <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)
función miembro pública, llama a la función
do_in miembro de la clase más derivada .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)
Si esta faceta
codecvt define una conversión, convierte los caracteres externos de la [from, from_end) rango de origen a los caracteres internos, colocando los resultados en las ubicaciones siguientes a partir de to. Convierte no más de from_end - from caracteres externos y no escribe más caracteres to_end - to internos. Hojas from_next y to_next señalando un más allá del último elemento convertido con éxito .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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Si esta faceta
codecvt no define una conversión, sin caracteres se convierten. to_next se fija para ser igual a to, state es invariable, y se devuelve std::codecvt_base::noconv .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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Valor de retorno
Un valor de std::codecvt_base::result tipo, que indica el estado de éxito de la siguiente manera:
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
|
conversión completa
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
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no hay suficiente espacio en la memoria intermedia de salida o final inesperado de buffer fuente
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
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encontrado un carácter que no se pudo convertir
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
|
esta faceta no es la conversión, no hay salida por escrito
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 especialización no convertir
std::codecvt<char, char, std::mbstate_t> siempre devuelve 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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Notas
Requiere que
from <= from_end && to <= to_end state y que, o bien que representa el estado inicial de cambios o los obtenidos mediante la conversión de los caracteres anteriores en la secuencia .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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El efecto sobre
state es deliberadamente no especificado. En las facetas estándar, que se utiliza para mantener un estado de cambios como cuando se llama a std::mbsrtowcs, y por tanto se actualiza para reflejar el estado de conversión después del último carácter de procesado externo, sino una faceta definida por el usuario es libre de usarlo para mantener cualquier otro estado, por ejemplo, contar el número de caracteres especiales se encuentran .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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Ejemplo
Ejecuta este código
#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';
}
Salida:
The string in wide encoding: zß水𝄋
Ver también
[virtual] |
lee el archivo asociado 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. (función miembro virtual protegida de std::basic_filebuf)
|
convierte una cadena de bytes en una cadena de ancho 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. (función miembro pública de std::wstring_convert)
| |
convierte una cadena de caracteres multibyte estrecho a la cadena de ancho, estado dado 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. (función) | |
[virtual] |
convierte una cadena de internt a externT, tales como cuando se escribe en el archivo 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. (función miembro virtual protegida) |