Re: coroutines

[Jamie Webb <j@...>]

On Friday 07 May 2004 03:07, Eric Jacobs wrote:
> On Fri, 7 May 2004 01:17:04 +0100
>
> Jamie Webb <j@jmawebb.cjb.net> wrote:
> > If I really felt the need to implement logic as a single function rather
> > than a state machine, I might start thinking about preprocessing the Lua
> > code, e.g. to turn this:
> >
> >     function my_game()
> >         local x = do_stuff()
> >         %YIELDPOINT%
> >         return do_more_stuff(x)
> >     end
> >
> > Into this:
> >
> >     function my_game()
> >         local x = do_stuff()
> >         return my_yield(42, x)
> >     end
> >
> >     continuations[42] = function(x)
> >          return do_more_stuff(x)
> >     end
>
> This is exactly what coroutines do in Lua 5!

Not quite. The point of the code above is that my_yield can be a Lua function 
which is able to serialise the current state (provided any userdata can be 
serialised). It can then be recovered multiple times, and in different 
instances of the VM.

-- Jamie Webb