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

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

-----Original Message-----
From: gam...@li...
[mailto:gam...@li...] On Behalf Of
Daniel Vogel
Sent: Wednesday, January 09, 2002 11:50 AM
To: cor...@sp...; Gam...@li...
Subject: RE: [GD-General] longjmp for C++

On Windows you can use exceptions for almost all case where you'd want
to
use longjmp/ setjmp. On Linux you can't use exceptions that well but
longjmp/ setjmp are extremely slow there :(

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.