std::codecvt::encoding, std::codecvt::do_encoding
De cppreference.com
| Definido en el archivo de encabezado <locale>
|
||
public:
int encoding() const
|
(1) | |
protected:
int do_encoding() const
|
(2) | |
1)
función miembro pública, llama a la función
do_encoding miembro de la clase más derivada .Original:
public member function, calls the member function
do_encoding of the most derived class.The text has been machine-translated via Google Translate.
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2) if the encoding represented by this codecvt facet maps each internal character to the same, constant number of external characters, returns that number. If the encoding is variable-length (e.g. UTF-8 or UTF-16), returns 0. If the encoding is state-dependent, returns -1.
Valor de retorno
The exact number of externT characters that correspond to one internT character, if constant. 0 if the number varies, -1 if the encoding is state-dependent.
La especialización no convertir
std::codecvt<char, char, std::mbstate_t> vuelve 1Original:
The non-converting specialization
std::codecvt<char, char, std::mbstate_t> returns 1The text has been machine-translated via Google Translate.
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Excepciones
Ejemplo
Ejecuta este código
#include <locale>
#include <iostream>
int main()
{
std::cout << "en_US.utf8 is a variable-length encoding, encoding() returns "
<< std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
std::locale("en_US.utf8")
).encoding() << '\n';
std::cout << "zh_CN.gb18030 is also variable-length, encoding() == "
<< std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
std::locale("zh_CN.gb18030")
).encoding() << '\n';
std::cout << "ru_RU.koi8r is a single-byte encoding encoding() == "
<< std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
std::locale("ru_RU.koi8r")
).encoding() << '\n';
}
Salida:
en_US.utf8 is a variable-length encoding, encoding() returns 0
zh_CN.gb18030 is also variable-length, encoding() == 0
ru_RU.koi8r is a single-byte encoding encoding() == 1