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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 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.
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