std::codecvt::max_length, std::codecvt::do_max_length
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<metanoindex/>
<tbody> </tbody>| Elemento definito nell'header <locale>
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public: int max_length() const |
(1) | |
protected: int do_max_length() const |
(2) | |
1)
do_max_length funzione membro della classe più derivata.do_max_length of the most derived class.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.
Valore di ritorno
The maximum number of externT characters that could be consumed if converted by do_in() to produce one internT character.
std::codecvt<char, char, std::mbstate_t> rendimenti 1std::codecvt<char, char, std::mbstate_t> returns 1You can help to correct and verify the translation. Click here for instructions.
Note
If the encoding is state-dependent (encoding() == -1), then more than max_length() external characters may be consumed to produce one internal character
Eccezioni
Esempio
#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";
}
Output:
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
Vedi anche
MB_CUR_MAX |
numero massimo di byte in un carattere multibyte nella corrente C locale
(variabili macro) Original: maximum number of bytes in a multibyte character in the current C locale (variabili macro) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[virtuale] |
restituisce il numero di caratteri externT necessari a produrre un carattere internt, se costante 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. (virtuale protetto funzione membro) |