RE: [GD-General] longjmp for C++

[Corrinne Y. <cor...@sp...>]

-----Original Message-----
From: gam...@li...
[mailto:gam...@li...] On Behalf Of
Thatcher Ulrich
Sent: Wednesday, January 09, 2002 12:47 PM
To: Gam...@li...
Subject: Re: [GD-General] longjmp for C++

On Jan 09, 2002 at 12:31 -0600, Corrinne Yu wrote:
> Out of curiosity, what are you using longjmp/setjmp for?
> 
> -- Daniel, Epic Games Inc.
> 
> -- It can be a convenient/lazy :) way to restart a clean game.
> 
> -- You set jump after all the startup but before game specific code.
> Then when a game ends, you can just long jump back to the state after
> startup but before game code. You can use the same idea to rewind a
game
> (after game data loaded, but before any game play changes has
started).
> 
> -- Another way (which is the way it is done now) is to do a full
cleanup
> after game ends and manually restores state to start up but before
game
> data load.
> 
> -- The lazy jump way of restarting is only safe for a pure C app. Our
> code base has now a lot of C++ classes and need to have their objects
be
> destroyed and constructed properly. Long jump is not guaranteed to do
> that correctly.

Neither setjmp/longjmp nor exceptions are going to do anything for
your heap, though, correct?  Which seems like the much tougher issue.

-- Not if all your heaps are part of the environment context, even your
C++ ones.

P.S. It's funny the mail editor insists longjmp should be spelled
longhop. :)