On 2010-08-31 05:17, Andrei Alexandrescu wrote:
On 8/30/10 20:04 PDT, dsimcha wrote:
I've been toying for a long time with the idea of a std.mixins for
Phobos that
would contain meta-implementations of commonly needed boilerplate code
for
mixing into classes and and structs. I've started to prototype it
(http://dsource.org/projects/scrapple/browser/trunk/std_mixins/std_mixins.d).
So far I have a mixin for struct comparisons, which is useful if you
need a
total ordering for use with sorting or binary trees, but don't care
exactly
how that ordering is defined. I've also got a mixin that converts a
class to
a Singleton, and uses thread-safe but efficient mechanisms to deal
with the
__gshared singleton case.
I'm also thinking of creating some mixins to allow cloning of arbitrarily
complicated object graphs, provided that you don't stray outside of
SafeD. Is
this worth implementing or will it likely be solved in some other way
at some
point?
Right now I'd just like to milk the D community for ideas. What other
pieces
of boilerplate code do you find yourself writing often that the standard
library should help with?
Sounds like a good idea, but I think the name is not too descriptive as
it refers to mechanism. We shouldn't have std.classes or std.structs in
there, should we? :o) Therefore std.mixins sounds like an awkward way to
group together pieces of functionality that may be very diverse.
FWIW I think you don't need any mixins to implement cloning. But I do
encourage you to work on cloning - I wanted for the longest time and
couldn't get to it. A cloning routine would need to keep a map of
pointer to pointer to make sure in only clones each object in a graph once.
Andrei
My serialization library Orange (http://dsource.org/projects/orange/)
could be used for cloning. The easiest way to do this is just to
serialize a value and then deserialize the data and return the new
value. Of course this wouldn't be the most efficient way, for that one
could build a cloning library/function out of the front end of the
serializer.
--
/Jacob Carlborg
