Reference
C Library
IOstream Library
Strings library
STL Containers
STL Algorithms
Miscellaneous
IOstream Library
manipulators
classes:
filebuf
fstream
ifstream
ios
iostream
ios_base
istream
istringstream
ofstream
ostream
ostringstream
streambuf
stringbuf
stringstream
objects:
cerr
cin
clog
cout
types:
fpos
streamoff
streampos
streamsize
streambuf
streambuf::streambuf
streambuf::~streambuf
public members:
streambuf::getloc
streambuf::in_avail
streambuf::pubimbue
streambuf::pubseekoff
streambuf::pubseekpos
streambuf::pubsetbuf
streambuf::pubsync
streambuf::sbumpc
streambuf::sgetc
streambuf::sgetn
streambuf::snextc
streambuf::sputbackc
streambuf::sputc
streambuf::sputn
streambuf::sungetc
protected members:
streambuf::eback
streambuf::egptr
streambuf::epptr
streambuf::gbump
streambuf::gptr
streambuf::pbase
streambuf::pbump
streambuf::pptr
streambuf::setg
streambuf::setp
virtual prot. members:
streambuf::imbue
streambuf::overflow
streambuf::pbackfail
streambuf::seekoff
streambuf::seekpos
streambuf::setbuf
streambuf::showmanyc
streambuf::sync
streambuf::uflow
streambuf::underflow
streambuf::xsgetn
streambuf::xsputn


streambuf::sbumpc

public member function
int sbumpc ( );

Get current character and increase get pointer

Returns the character currently pointed by the get pointer and advances it one position.

During its operation, the function will call the protected virtual member function uflow if the get pointer gptr points to the same position as the end pointer egptr before the call (or if it is a null pointer).

Notice that, although similar, the following functions have different behaviors:
  • sgetc: returns the character pointed by the get pointer.
  • sbumpc: advances the get pointer and returns the character pointed by it before the call.
  • snextc: advances the get pointer and returns the character pointed by it after the call.

Parameters

none

Return Value

The character pointed by the old position of the get pointer (type-casted to the appropiate return type).
If the controlled input sequence has exhausted, and uflow could not retrieve more characters, the function returns EOF (or traits::eof() for other traits).

Example

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
// show file content - sbumpc () example
#include <iostream>
#include <fstream>
using namespace std;
int main () {
  char ch;
  streambuf * pbuf;
  ifstream istr ("test.txt");
  pbuf = istr.rdbuf();
  while (pbuf->sgetc()!=EOF)
  {
     ch = pbuf->sbumpc();
     cout << ch;
  }
  istr.close();
  return 0;
}


This example shows the content of a file on screen, using the combination of sgetc and sbumpc to read the input file.

Basic template member declaration

( basic_streambuf<charT,traits> )
1
2
 
typedef traits::int_type int_type;
int_type sbumpc ( );


See also

streambuf::snextc Increase get pointer and return next character (public member function)
streambuf::sgetc Get current character (public member function)
streambuf::sgetn Get sequence of characters (public member function)