std::basic_filebuf::showmanyc – cppreference.com

std::basic_filebuf::showmanyc

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<metanoindex/>

 
C++
 
Input / Output-Bibliothek
I / O-Manipulatoren
C-style I / O
Puffern
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
Original:
Streams
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Abstraktionen
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Datei-I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
Original:
Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_filebuf
Öffentliche Member-Funktionen
Original:
Public member functions
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basic_filebuf::basic_filebuf
basic_filebuf::~basic_filebuf
basic_filebuf::operator=(C++11)
basic_filebuf::swap(C++11)
basic_filebuf::is_open
basic_filebuf::open
basic_filebuf::close
Geschützt Member-Funktionen
Original:
Protected member functions
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basic_filebuf::showmanyc
basic_filebuf::underflow
basic_filebuf::uflow
basic_filebuf::pbackfail
basic_filebuf::overflow
basic_filebuf::setbuf
basic_filebuf::seekoff
basic_filebuf::seekpos
basic_filebuf::sync
basic_filebuf::imbue
Non-Member-Funktionen
Original:
Non-member functions
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swap(std::basic_filebuf)(C++11)
 
<tbody> </tbody>
protected: virtual std::streamsize showmanyc()
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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Parameter

(None)
Original:
(none)
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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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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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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

Siehe auch