On 06-Oct-12 21:03, Arlen wrote:
Greetings,
In one of my D projects a units library was needed, so I decided to port Boost.Units to
D. I've been working on it for the past month or so (mostly on the weekends), and It's
about 90% done. The work has also produced additional functionality not yet available in
Phobos, so I've decided to separate them into their own modules and present them here as
my preliminary submission. At the time I wasn't aware of the Boost submission process,
otherwise I would have done "Determine Interest" first. Hopefully nobody has
ported Boost.Units to D.
So far the completion of the units library is contingent on the finalization of
the design and implementation of the following two modules:
std.rational, which is a small module for rational numbers.
Source: https://github.com/Arlen/phobos/blob/units/std/rational.d
Docs: http://arlen.github.com/phobos/std_rational.html
Cool, does it work with BigInt?
Also I think there is better version of toString that has signature:
void toString(scope void delegate(const(char)[]) sink)
this toString just use functions like formattedWrite to write chars to
sink. It thus totally avoids overhead of allocating strings.
Your current code may have some bad impact on performance:
return "(" ~ to!string(res.numerator) ~ "/" ~ to!string(res.denominator)
~ ")";
Allocates 4 times. ~ operator is convenient shortcut to get job done but
it's unsuitable for building strings and formatted output.
std.typelist, which provides the TypeList type and several metafunctions. The
metafunctions are pretty much stolen from Haskell.
Source: https://github.com/Arlen/phobos/blob/units/std/typelist2.d
Docs: http://arlen.github.com/phobos/std_typelist2.html
I concur with the general idea that it needs to be folded into
std.typetuple unless there is some *really* compelling reason not to.
I wasn't aware that we already had std.typelist module in Phobos until I was
ready to submit my work. I suppose the work was abandoned or it was never
finalized? There are differences in typelist2.d and typelist.d, though.
Old and never finalized.
Recently re-'discovered'. It never participated in
the compilation of Phobos and sort of went under the radar.
--
Dmitry Olshansky
