[Bug c++/17611] New: ifstream could not read multiple files

["kemin dot zhou at ferring dot com" <gcc-bugzilla@gcc.gnu.org>]

ifstream objects could not open multiple files.
if ifstream objects have reached the end of the stream, then opening another
files requires to clear() otherwise it failed to open a second file.

example code:
ifstream IN("test1.txt");
while (IN>>line) cout << line << endl;
// at this point IN.bad() == true
IN.close();
// you must give the following command 
IN.clear();
// otherwise the following statement will fail
IN.open("test2.txt");
IN.fail() == true if the bad bit is not cleared.
====
The standard behavior is for the 
ifstream::open(string &infilename) {
  if (bad()) clear();
  ......
}

==========
reading file to the end in the first operation should not have prevented the
opening of the second file.

-- 
           Summary: ifstream could not read multiple files
           Product: gcc
           Version: 3.3.4
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kemin dot zhou at ferring dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: Linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17611