std::codecvt::max_length, std::codecvt::do_max_length
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| definiert in Header <locale>
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| public: int max_length() const |
(1) | |
| protected: int do_max_length() const |
(2) | |
öffentliche Member-Funktion ruft die Member-Funktion
do_max_length der am meisten abgeleiteten Klasse .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.
Inhaltsverzeichnis |
[Bearbeiten] Rückgabewert
The maximum number of externT characters that could be consumed if converted by do_in() to produce one internT character.
Die nicht-Converting-Spezialisierung std::codecvt<char, char, std::mbstate_t> kehrt 1
Original:
The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns 1
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[Bearbeiten] Notes
If the encoding is state-dependent (encoding() == -1), then more than max_length() external characters may be consumed to produce one internal character
[Bearbeiten] Ausnahmen
[Bearbeiten] Beispiel
#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
[Bearbeiten] Siehe auch
| MB_CUR_MAX |
maximale Anzahl von Bytes in einer Multibyte-Zeichen in der aktuellen C locale
(Makro-Variablen) Original: maximum number of bytes in a multibyte character in the current C locale (Makro-Variablen) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| [virtuell] |
gibt die Anzahl der externT Zeichen notwendig, um ein Internt Charakter zu produzieren, wenn konstant 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. (virtuellen geschützten Member-Funktion) |
