std::codecvt::encoding, std::codecvt::do_encoding - cppreference.com

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Definido no cabeçalho `<locale>`

`public: int encoding() const`	(1)

`protected: int do_encoding() const`	(2)

função de membro público, chama a do_encoding função de membro da classe derivada mais.

Original:

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

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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.

A especialização não-conversão std::codecvt<char, char, std::mbstate_t> retornos 1

Original:

The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns 1

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Exceções

Exemplo

#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';
}

Saída:

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

Veja também


	número máximo de bytes em um caractere multibyte na atual C locale (variável macro) Original: maximum number of bytes in a multibyte character in the current C locale (variável macro) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. [edit]

	devolve o número máximo de caracteres externT que poderia ser convertido em um único caractere internt Original: returns the maximum number of externT characters that could be converted into a single internT character The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtual protegido função de membro) [edit]