On Tue, 9 Jul 2002 16:42:03 +0100, Peter Haworth wrote:
> > When you invoke a continuation you put the call scratchpads and lexical
> > scratchpads back to the state they were when you took the continuation.
>
> If you restore the lexicals, how does this ever finish?
Never mind. It's the *acces
On Mon, 8 Jul 2002 16:54:16 -0400, Dan Sugalski wrote:
> while ($foo) {
> $foo--;
> }
>
> Pretty simple. (For illustrative purposes) To do that with
> continuations, it'd look like:
>
> $cont = take_continuation();
> if ($foo) {
> $foo--;
> invoke($cont);
>
On Mon, 8 Jul 2002, [EMAIL PROTECTED] wrote:
> Yep. But serializing continuations is either tough, or not
> completely doable, since programs tend to have handles on things
> outside their direct control like filehandles, sockets, database
> connections, and suchlike things. Resuming a continuatio
Thus it was written in the epistle of Peter Scott,
>
> So if you could serialize a continuation, you could freeze your program
> state to disk and restore it later? Cool, makes for easy checkpoint/restarts.
I think that that would be true only if *all* data was maintained in those
scratchpads
At 10:24 PM +0100 7/8/02, Nicholas Clark wrote:
>On Mon, Jul 08, 2002 at 04:54:16PM -0400, Dan Sugalski wrote:
>> Pretty simple. (For illustrative purposes) To do that with
>> continuations, it'd look like:
>>
>> $cont = take_continuation();
>> if ($foo) {
>> $foo--;
>> invok
At 3:01 PM -0700 7/8/02, Peter Scott wrote:
>At 04:54 PM 7/8/02 -0400, Dan Sugalski wrote:
>>A continuation is a sort of super-closure. Like a closure it
>>captures its lexical variables, so every time you use it, you're
>>referring to the same set of variables, which live on until the
>>contin
At 04:54 PM 7/8/02 -0400, Dan Sugalski wrote:
>A continuation is a sort of super-closure. Like a closure it captures
>its lexical variables, so every time you use it, you're referring to
>the same set of variables, which live on until the continuation's
>destroyed. This works because the variab
On Mon, Jul 08, 2002 at 04:54:16PM -0400, Dan Sugalski wrote:
> Pretty simple. (For illustrative purposes) To do that with
> continuations, it'd look like:
>
>$cont = take_continuation();
>if ($foo) {
> $foo--;
> invoke($cont);
>}
>
> take_continuation() returns a continua
On Mon, 8 Jul 2002, Dan Sugalski wrote:
> Pretty simple. (For illustrative purposes) To do that with
> continuations, it'd look like:
>
> $cont = take_continuation();
> if ($foo) {
> $foo--;
> invoke($cont);
> }
>
> take_continuation() returns a continuation for the curren
Okay, for those of you following along at home, here's a quick
rundown of what a continuation is, and how it works. (This is made
phenomenally easier by the fact that perl has continations--try
explaining this to someone used to allocating local variables on the
system stack and get ready for
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