Re: TIP #233: Virtualization of Tcl's Sense of Time

From: Donal K. Fellows (donal.k.fellows_at_manchester.ac.uk)
Date: 12/08/04 

Date: Wed, 08 Dec 2004 10:11:22 +0000

KRF wrote:
> Will the implementation handle "negative time steps"?

Only if you're simulating a Tcl interpreter that's been enabled with the
full [after -1] functionality. :^)

> In nuclear power plant simulators (perhaps not the type of simulator
> you had in mind), we often associate a particular time of day or even
> year with a particular "initial condition" (IC) set. When the user
> selects an IC set, the simulator time can take large forward or
> backwards steps.

FWIW (as someone whose written microchip simulators) I'd treat that as a
state-load event (the current time is an aspect of the state of course)
and not a time-change. Otherwise you've got a general causality fault,
which isn't too good unless you're an SF writer. :^)

Donal.

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