On Tue, 2007-05-01 at 11:56 -0700, Erick Tryzelaar wrote:
> I was reading through the lexer and I noticed that we don't support
> imaginary and complex literals like "1.0d + 0.5di". Would this be
> something useful to have? We'd possibly would have to write our own
> imaginary and complex types if there isn't a c++ version of them
> available, unless you guys think it's standard enough to depend on. This
> could be another handy thing for 1.1.4.
There are a couple of issues. First, C++ has complex and so does
Felix. Unfortunately C99 also has complex, and it's a different
type altogether.
Second, engineers use 'j', mathematicians use 'i'.
If we go up to Quaternions, they use i,j,k. You may have
used quaternions in high school physics, you write:
10 + 3i + 4j + 5k
to give an event location: 10 seconds, 3,4,5 metres x,y,height
coordinates. They're cool because the tensor product needed
for things like angular momentum 'just drops out' from the
axioms like i * i = -1 etc.
Otherwise, yes you could do it .. of course 'i' is nasty
because it also means 'integer':
10i // int
10.1i // imaginary
which leaves gaussian integers in the cold :)
--
John Skaller <skaller at users dot sf dot net>
Felix, successor to C++: http://felix.sf.net
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