Tcl_DiscardResult man page on QNX

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Tcl_SaveResult(3)	    Tcl Library Procedures	     Tcl_SaveResult(3)

______________________________________________________________________________

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 inter‐
					      preter result should be saved or
					      restored.
_________________________________________________________________

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 rou‐
       tines 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 routines
       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 inter‐
       preter 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  uninitialized  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

Tcl				      8.1		     Tcl_SaveResult(3)
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