RWvios(3C++)

Name
     RWvios - Rogue Wave library class

Synopsis
              #include <vstream.h>




          (abstract base class)




Description
     RWvios is an abstract base class.  It defines an interface similar to the
     C++ streams class ios.  However, unlike ios, it offers the advantage of
     not necessarily being associated with a streambuf. This is useful for
     classes that cannot use a streambuf in their implementation.  An example
     of such a class is RWXDRistream, where the XDR model does not permit
     streambuf functionality.  Specializing classes that do use streambufs in
     their implementation (e.g., RWpistream) can usually just return the
     corresponding ios function.

Persistence
     None

Public Member Functions
              virtual int
          eof() = 0;


     Returns a nonzero integer if an EOF has been encountered.

              virtual int
          fail() = 0;


     Returns a nonzero integer if the fail or bad bit has been set.  Normally,
     this indicates that some storage or retrieval has failed but that the
     stream is still in a usable state.

              virtual int
          bad() = 0;


     Returns a nonzero integer if the bad bit has been set.  Normally this
     indicates that a severe error has occurred from which recovery is
     probably impossible.
              virtual int
          good() = 0;


     Returns a nonzero integer if no error bits have been set.

              virtual int
          rdstate() = 0;


     Returns the current error state.

              virtual void
          clear(int v=0) = 0;


     Sets the current error state to v.  If v is zero, then this clears the
     error state.

              operator void*();


     If fail() then return 0 else return self.