Hi,

I wrote this small module ( https://github.com/lodo1995/polymorph.d ), taking inspiration from Amaury Sechet's great talk at DConf ( http://dconf.org/2016/talks/sechet.html ).

I plan to use it in std.experimental.xml ( https://github.com/lodo1995/experimental.xml ) for the DOM hierarchy, to avoid the use of garbage collected classes.

Do you think that somethink like this (maybe done a bit better) may be worth having in the standard library?

Thank you in advance,

Lodovico Giaretta

On 15/05/2016 12:25 AM, Lodovico Giaretta wrote:
> Hi,
>
> I wrote this small module ( https://github.com/lodo1995/polymorph.d ),
> taking inspiration from Amaury Sechet's great talk at DConf (
> http://dconf.org/2016/talks/sechet.html ).
>
> I plan to use it in std.experimental.xml (
> https://github.com/lodo1995/experimental.xml ) for the DOM hierarchy, to
> avoid the use of garbage collected classes.
>
> Do you think that somethink like this (maybe done a bit better) may be
> worth having in the standard library?
>
> Thank you in advance,
>
> Lodovico Giaretta

So a little bit like my managed memory[0] concept only with more magic and less extendable.

[0] https://github.com/rikkimax/alphaPhobos/blob/master/source/std/experimental/memory/managed.d

On Saturday, 14 May 2016 at 12:25:30 UTC, Lodovico Giaretta wrote:
> I wrote this small module ( https://github.com/lodo1995/polymorph.d ), taking inspiration from Amaury Sechet's great talk at DConf ( http://dconf.org/2016/talks/sechet.html ).

Somewhat related are my lightweight variant implementations

- `WordVariant` at

https://github.com/nordlow/phobos-next/blob/master/src/variant_ex.d#L49

and

- `VariantPointerTo` at

https://github.com/nordlow/phobos-next/blob/master/src/variant_ex.d#L258

They both use the upper bits of a word (currently 64-bit only) for type-information. See the unittest for details on usage.

The `WordVariant` was needed in my implementation of a high-performance and memory efficient pure D implementation of prefix-trie at

https://github.com/nordlow/phobos-next/blob/master/src/trie.d

It will provide flexible use of memory, either using the GC or not. It's also, when possible, always @safe pure nothrow.

The trie is very much in development right now, but I will announce its presence as soon as it stabilizes.