std::basic_filebuf::showmanyc
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| protected: virtual std::streamsize showmanyc() |
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Wenn implementiert, gibt die Anzahl der Zeichen aus der Datei zu lesen .
Original:
If implemented, returns the number of characters left to read from the file.
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Inhaltsverzeichnis |
[Bearbeiten] Parameter
(None)
Original:
(none)
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[Bearbeiten] Rückgabewert
Die Anzahl der noch verfügbaren Zeichen für das Lesen aus der Datei oder -1, wenn das Ende der Datei erreicht wurde .
Original:
The number of characters available for reading from the file, or -1 if the end of file was reached.
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[Bearbeiten] Notes
Diese Funktion ist optional. Wenn nicht implementiert, gibt diese Funktion 0 (da die Basisklassenversion std::basic_streambuf::showmanyc aufgerufen wird)
Original:
This function is optional. If not implemented, this function returns 0 (since the base class version std::basic_streambuf::showmanyc gets called)
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Ob implementiert oder nicht, wird diese Funktion normalerweise durch std::basic_streambuf::in_avail aufgerufen, wenn der get-Bereich ist leer .
Original:
Whether implemented or not, this function is normally called by std::basic_streambuf::in_avail if the get area is empty.
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[Bearbeiten] Beispiel
Umsetzung Test, um zu sehen, ob showmanyc () für filebuf umgesetzt wird
Original:
implementation test to see if showmanyc() is implemented for filebuf
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#include <fstream> #include <iostream> struct mybuf : std::filebuf { using std::filebuf::showmanyc; }; int main() { mybuf fin; fin.open("test.in", std::ios_base::in); std::cout << "showmanyc() returns " << fin.showmanyc() << '\n'; }
Output:
showmanyc() returns 6626
[Bearbeiten] Siehe auch
| erhält die Anzahl der Zeichen sofort in der get-Bereich Original: obtains the number of characters immediately available in the get area The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of std::basic_streambuf)
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| extrahiert bereits verfügbaren Blöcke von Zeichen Original: extracts already available blocks of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of std::basic_istream)
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