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digitalmars.D - polymorph.d: polymorphic refcounted wrappers for D structs

reply Lodovico Giaretta <lodovico giaretart.net> writes:
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
May 14 2016
next sibling parent rikki cattermole <rikki cattermole.co.nz> writes:
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
May 14 2016
prev sibling parent =?UTF-8?B?Tm9yZGzDtnc=?= <per.nordlow gmail.com> writes:
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.
May 14 2016