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NAME
     Tcl_SaveResult, Tcl_RestoreResult, Tcl_DiscardResult -  save
     and restore an interpreter's result

SYNOPSIS
     #include <tcl.h>

     Tcl_SaveResult(interp, statePtr)

     Tcl_RestoreResult(interp, statePtr)

     Tcl_DiscardResult(statePtr)

ARGUMENTS
     Tcl_Interp        *interp    (in)      Interpreter for which
                                            state    should    be
                                            saved.

     Tcl_SavedResult   *statePtr  (in)      Pointer  to  location
                                            where     interpreter
                                            result   should    be
                                            saved or restored.
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DESCRIPTION
     These routines allows a C procedure to take  a  snapshot  of
     the  current  interpreter  result so that it can be restored
     after a call to Tcl_Eval or some other routine that modifies
     the interpreter result.  These routines are passed a pointer
     to a structure that is used to store enough  information  to
     restore the interpreter result state.  This structure can be
     allocated on the stack of the calling procedure.  These rou-
     tines  do not save the state of any error information in the
     interpreter (e.g. the errorCode or errorInfo variables).

     Tcl_SaveResult moves the string and object results of interp
     into  the  location  specified  by statePtr.  Tcl_SaveResult
     clears the result for interp and leaves the  result  in  its
     normal empty initialized state.

     Tcl_RestoreResult moves the string and object  results  from
     statePtr  back  into  interp.   Any result or error that was
     already in the interpreter will be cleared.  The statePtr is
     left  in  an  uninitialized  state  and cannot be used until
     another call to Tcl_SaveResult.

     Tcl_DiscardResult  releases  the  saved  interpreter   state
     stored at statePtr.  The state structure is left in an unin-
     itialized state and cannot be used  until  another  call  to
     Tcl_SaveResult.

     Once  Tcl_SaveResult  is  called  to  save  the  interpreter
     result,  either  Tcl_RestoreResult or Tcl_DiscardResult must
     be called to properly clean up the  memory  associated  with
     the saved state.


KEYWORDS
     result, state, interp

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