basic_streambuf::in_avail
Returns the number of elements that are ready to be read from the buffer.
streamsize in_avail( );
Return Value
The number of elements that are ready to be read from the buffer.
Remarks
If a read position is available, the member function returns egptr – gptr. Otherwise, it returns showmanyc.
Example
// basic_streambuf_in_avail.cpp
// compile with: /EHsc
#include <iostream>
int main( )
{
using namespace std;
char c;
// cin's buffer is empty, in_avail will return 0
cout << cin.rdbuf( )->in_avail( ) << endl;
cin >> c;
cout << cin.rdbuf( )->in_avail( ) << endl;
}
Input
4
Sample Output
0
4
1
Requirements
Header: <streambuf>
Namespace: std