std::codecvt::max_length, std::codecvt::do_max_length
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<tbody> </tbody>| Definido no cabeçalho <locale>
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public: int max_length() const |
(1) | |
protected: int do_max_length() const |
(2) | |
1)
função de membro público, chama a
do_max_length função de membro da classe derivada mais.Original:
public member function, calls the member function
do_max_length of the most derived class.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
2) returns the maximum value that do_length(state, from, from_end, 1) can return for any valid range [from, from_end) and any valid state.
Valor de retorno
The maximum number of externT characters that could be consumed if converted by do_in() to produce one internT character.
A especialização não-conversão
std::codecvt<char, char, std::mbstate_t> retornos 1Original:
The non-converting specialization
std::codecvt<char, char, std::mbstate_t> returns 1The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Notas
If the encoding is state-dependent (encoding() == -1), then more than max_length() external characters may be consumed to produce one internal character
Exceções
Exemplo
#include <locale>
#include <iostream>
#include <codecvt>
int main()
{
std::cout << "In codecvt_utf8, the longest multibyte character is "
<< std::codecvt_utf8<wchar_t>().max_length() << " bytes long\n";
std::cout << "In header-consuming codecvt_utf8, the longest multibyte character is "
<< std::codecvt_utf8<wchar_t,
0x10ffff,
std::consume_header>().max_length() << " bytes long\n";
std::cout << "In this system's en_US.utf8, the longest multibyte character is "
<< std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
std::locale("en_US.utf8")
).max_length() << " bytes long\n";
std::cout << "In this system's zh_CN.gb18030, the longest multibyte character is "
<< std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
std::locale("zh_CN.gb18030")
).max_length() << " bytes long\n";
}
Saída:
In codecvt_utf8, the longest multibyte character is 4 bytes long
In header-consuming codecvt_utf8, the longest multibyte character is 7 bytes long
In this system's en_US.utf8, the longest multibyte character is 6 bytes long
In this system's zh_CN.gb18030, the longest multibyte character is 4 bytes long
Veja também
MB_CUR_MAX |
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. |
[virtual] |
retorna o número de caracteres externT necessários para produzir um caráter internt, se constante Original: returns the number of externT characters necessary to produce one internT character, if constant 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) |