How do I find out if new input from cin input stream (or possibly stdin) is available? I was expecting I could use the is_avail() member function of istream for this. But the sample code from: http://www.cplusplus.com/ref/iostream/streambuf/in_avail.html seems to indicate that is_avail() always returns 0 !!? //http://www.cplusplus.com/ref/iostream/streambuf/in_avail.html // in_avail () example #include <iostream> using namespace std; int main () { streamsize size; char ch; streambuf * pbuf; pbuf = cin.rdbuf(); cout << "Please enter some characters: "; cin >> ch; size = pbuf->in_avail(); cout << "The first character you entered is: " << ch << endl; cout << size << " additional characters in input buffer" << endl; cout << cin.rdbuf()->in_avail() << " additional characters in input buffer" << endl; cin >> ch; size = pbuf->in_avail(); cout << "The second character you entered is: " << ch << endl; cout << size << " additional characters in input buffer" << endl; cout << cin.rdbuf()->in_avail() << " additional characters in input buffer" << endl; return 0; } After compiling under cygwin (dll 1.3.1-1) and running I get: $ gcc test.cpp /lib/libstdc++.a $ ./a.exe Please enter some characters: cygwin The first character you entered is: c 0 additional characters in input buffer The second character you entered is: y 0 additional characters in input buffer I was expecting the in_avail() function to return 6 after the first cin>>ch; instead I get 0 !? Are my expectations wrong? Is there another non-blocking way to find out if more keystrokes are available or not? Berni. -- Want to unsubscribe from this list? Check out: http://cygwin.com/ml/#unsubscribe-simple
