std::codecvt::max_length, std::codecvt::do_max_length
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<tbody> </tbody>| Déclaré dans l'en-tête <locale>
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public: int max_length() const |
(1) | |
protected: int do_max_length() const |
(2) | |
1)
fonction de membre du public, appelle le
do_max_length fonction membre de la classe la plus dérivée .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.
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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.
Retourne la valeur
The maximum number of externT characters that could be consumed if converted by do_in() to produce one internT character.
La spécialisation non-conversion
std::codecvt<char, char, std::mbstate_t> retours 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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Notes
If the encoding is state-dependent (encoding() == -1), then more than max_length() external characters may be consumed to produce one internal character
Exceptions
Exemple
#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";
}
Résultat :
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
Voir aussi
MB_CUR_MAX |
nombre maximal d'octets dans un caractère multi-octets dans le courant C locale
( variable de macro ) Original: macro variable The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. Original: maximum number of bytes in a multibyte character in the current C locale ( variable de macro ) Original: macro variable The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[ virtuel ]Original: virtual The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
retourne le nombre de caractères Externt nécessaires pour produire une Internt caractère, si 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. (fonction membre virtuelle protégée) |