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-'\"
-'\" Copyright (c) 1997 by Sun Microsystems, Inc.
-'\" Contributions from Don Porter, NIST, 2004. (not subject to US copyright)
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tcl_SaveResult 3 8.1 Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tcl_SaveInterpState, Tcl_RestoreInterpState, Tcl_DiscardInterpState, Tcl_SaveResult, Tcl_RestoreResult, Tcl_DiscardResult \- save and restore an interpreter's state
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-.sp
-Tcl_InterpState
-\fBTcl_SaveInterpState\fR(\fIinterp, status\fR)
-.sp
-int
-\fBTcl_RestoreInterpState\fR(\fIinterp, state\fR)
-.sp
-\fBTcl_DiscardInterpState\fR(\fIstate\fR)
-.sp
-\fBTcl_SaveResult\fR(\fIinterp, savedPtr\fR)
-.sp
-\fBTcl_RestoreResult\fR(\fIinterp, savedPtr\fR)
-.sp
-\fBTcl_DiscardResult\fR(\fIsavedPtr\fR)
-.SH ARGUMENTS
-.AS Tcl_InterpState savedPtr
-.AP Tcl_Interp *interp in
-Interpreter for which state should be saved.
-.AP int status in
-Return code value to save as part of interpreter state.
-.AP Tcl_InterpState state in
-Saved state token to be restored or discarded.
-.AP Tcl_SavedResult *savedPtr in
-Pointer to location where interpreter result should be saved or restored.
-.BE
-.SH DESCRIPTION
-.PP
-These routines allows a C procedure to take a snapshot of the current
-state of an interpreter so that it can be restored after a call
-to \fBTcl_Eval\fR or some other routine that modifies the interpreter
-state.  There are two triplets of routines meant to work together.
-.PP
-The first triplet stores the snapshot of interpreter state in
-an opaque token returned by \fBTcl_SaveInterpState\fR.  That token
-value may then be passed back to one of \fBTcl_RestoreInterpState\fR
-or \fBTcl_DiscardInterpState\fR, depending on whether the interp
-state is to be restored.  So long as one of the latter two routines
-is called, Tcl will take care of memory management.
-.PP
-The second triplet stores the snapshot of only the interpreter
-result (not its complete state) in memory allocated by the caller.
-These routines are passed a pointer to a \fBTcl_SavedResult\fR structure
-that is used to store enough information to restore the interpreter result.
-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 \fB\-errorcode\fR or
-\fB\-errorinfo\fR return options, when an error is in progress).
-.PP
-Because the routines \fBTcl_SaveInterpState\fR,
-\fBTcl_RestoreInterpState\fR, and \fBTcl_DiscardInterpState\fR perform
-a superset of the functions provided by the other routines,
-any new code should only make use of the more powerful routines.
-The older, weaker routines \fBTcl_SaveResult\fR, \fBTcl_RestoreResult\fR,
-and \fBTcl_DiscardResult\fR continue to exist only for the sake
-of existing programs that may already be using them.
-.PP
-\fBTcl_SaveInterpState\fR takes a snapshot of those portions of
-interpreter state that make up the full result of script evaluation.
-This include the interpreter result, the return code (passed in
-as the \fIstatus\fR argument, and any return options, including
-\fB\-errorinfo\fR and \fB\-errorcode\fR when an error is in progress.
-This snapshot is returned as an opaque token of type \fBTcl_InterpState\fR.
-The call to \fBTcl_SaveInterpState\fR does not itself change the
-state of the interpreter.  Unlike \fBTcl_SaveResult\fR, it does
-not reset the interpreter.
-.PP
-\fBTcl_RestoreInterpState\fR accepts a \fBTcl_InterpState\fR token
-previously returned by \fBTcl_SaveInterpState\fR and restores the
-state of the interp to the state held in that snapshot.  The return
-value of \fBTcl_RestoreInterpState\fR is the status value originally
-passed to \fBTcl_SaveInterpState\fR when the snapshot token was
-created.
-.PP
-\fBTcl_DiscardInterpState\fR is called to release a \fBTcl_InterpState\fR
-token previously returned by \fBTcl_SaveInterpState\fR when that
-snapshot is not to be restored to an interp.
-.PP
-The \fBTcl_InterpState\fR token returned by \fBTcl_SaveInterpState\fR
-must eventually be passed to either \fBTcl_RestoreInterpState\fR
-or \fBTcl_DiscardInterpState\fR to avoid a memory leak.  Once
-the \fBTcl_InterpState\fR token is passed to one of them, the
-token is no longer valid and should not be used anymore.
-.PP
-\fBTcl_SaveResult\fR moves the string and value results
-of \fIinterp\fR into the location specified by \fIstatePtr\fR.
-\fBTcl_SaveResult\fR clears the result for \fIinterp\fR and
-leaves the result in its normal empty initialized state.
-.PP
-\fBTcl_RestoreResult\fR moves the string and value results from
-\fIstatePtr\fR back into \fIinterp\fR.  Any result or error that was
-already in the interpreter will be cleared.  The \fIstatePtr\fR is left
-in an uninitialized state and cannot be used until another call to
-\fBTcl_SaveResult\fR.
-.PP
-\fBTcl_DiscardResult\fR releases the saved interpreter state
-stored at \fBstatePtr\fR.  The state structure is left in an
-uninitialized state and cannot be used until another call to
-\fBTcl_SaveResult\fR.
-.PP
-Once \fBTcl_SaveResult\fR is called to save the interpreter
-result, either \fBTcl_RestoreResult\fR or
-\fBTcl_DiscardResult\fR must be called to properly clean up the
-memory associated with the saved state.
-.SH KEYWORDS
-result, state, interp