[phobos] RFC: units type for D

David Simcha dsimcha at gmail.com
Wed Aug 25 20:15:42 PDT 2010

  Ok, I'm working on bit rot repair in my rational library.  Does anyone 
know of a way, in light of Bug 3659 
(http://d.puremagic.com/issues/show_bug.cgi?id=3659) to allow testing 
two structs for equality when the r.h.s. is an anonymous rvalue or not 
exactly the same type?  I refuse to commit a library where something 
this basic doesn't work (especially since I'd have to make things 
lvalues for no good reason in a zillion places in my unit tests), but it 
looks like 3659 makes this impossible.

Also, is there any good reason why BigInt doesn't overload cast 
operators?  Should I fix this?  IMHO cast(long) someBigInt should work 
especially since BigInt already has a .toLong() method.

On 8/25/2010 10:58 PM, Andrei Alexandrescu wrote:
> This is a very interesting discussion, with great points. Here's what 
> I think - in brief, my experience time and again has been that stuff 
> that has a strong champion behind it succeeds, and stuff that doesn't, 
> doesn't. In light of that, if Benjamin and/or David are enthused about 
> pushing their libraries into Phobos, and furthermore maintaining and 
> enhancing them, and further-furthermore contributing in new ways to 
> Phobos, then I think it's not crucial that dimensional analysis (and 
> possibly rational numbers) are of narrow utility.
> One less positive example is std.json - after adding it to Phobos, 
> Jeremie didn't hang around to maintain it, bring its style on par with 
> the rest of Phobos etc. Right now it's a library in need of a 
> champion. Not to mention the likes of std.xml :o).
> So, subject to the rest of the team being approving too, I'd say let's 
> give dimensional analysis (and rational numbers too if David wants) a 
> fair shot at inclusion in Phobos. Be prepared for ruthlessness though 
> :o).
> Andrei
> On 8/25/10 19:37 PDT, David Simcha wrote:
>> One comment I want to make is that, if we're going to include this, I
>> have a rational number library on Scrapple that I've been meaning to put
>> up for review for a while. I noticed that you roll your own somewhat
>> ad-hoc rational numbers for the units type and don't really expose them
>> in any more general way. IMHO if both rational and the units lib make
>> the cut for Phobos, they should be integrated with each other. I'll
>> clean up my rational library and do a commit, since it's succumbed to
>> some degree of bit rot. It's at
>> http://dsource.org/projects/scrapple/browser/trunk/rational/rational.d.
>> On 8/25/2010 10:09 AM, Benjamin Shropshire wrote:
>>> I have offered up a library that supports statically encoding units in
>>> the type system so as to prevent unit errors (adding distance and
>>> time) and to enforce correct conversions all around.
>>> http://d.puremagic.com/issues/show_bug.cgi?id=3725
>>> I'm looking for comments: What's holding it back from inclusion? What
>>> would need to be improved? The API? Better comments? (I haven't tested
>>> it recently so; make it build again?)
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