Has Anyone Got A Directory \\\"Walker\\\" Available

Brian Milby brian at milby7.com
Mon May 7 15:53:32 EDT 2018


I think we may be in the territory of pre-mature optimization. There is
going to be a bit more overhead creating a copy-on-write object than a
pass-by-reference object, but the real gains (over the old way) are going
to be seen with objects that are “large”. If you run a profiler and need to
improve a section of code, then this would be something to have in the
toolbox. It probably isn’t a good practice to use everywhere since then you
have to be careful about changing the value of a parameter.

It would be interesting to see that same piece of code run before the
change. When did copy on write get introduced?
On Mon, May 7, 2018 at 2:20 PM Richard Gaskin via use-livecode <
use-livecode at lists.runrev.com> wrote:

> Mark Wieder wrote:
>
>  > On 05/06/2018 02:42 PM, Richard Gaskin via use-livecode wrote:
>  >
>  >> Did copy-on-write get changed in v9, or is the scope of its effects
>  >> just more limited than I had understood it to be?
>  >
>  > I'm still at the point of not trusting copy-on-write yet, but I think
>  > you're misinterpreting your results. If I'm understanding the way in
>  > which LC has implemented copy-on-write, then whether or not you use
>  > references in parameters, the "return p-1" code will have to make a
>  > copy on the stack to return a value - you can't just return a
>  > reference. So all you're changing by removing the "@" is one level of
>  > copying.
>
> That makes sense.  Thanks.
>
> --
>   Richard Gaskin
>   Fourth World Systems
>   Software Design and Development for the Desktop, Mobile, and the Web
>   ____________________________________________________________________
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