[Issue 10466] Optional "[]" syntax for std.range.iota too

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10466



--- Comment #3 from bearophile_hugs at eml.cc 2013-08-25 15:23:48 PDT ---
(In reply to comment #2)
> I like this idea, though there are some corner cases we need to clarify,
> namely, what should iota!"(]"(0.0, 1.0, 0.3) and iota!"()"(0.0, 1.0, 0.3) do?

I don't use iota with floating point arguments, it's too much tricky. I prefer
to write code that doesn't make my head hurt trying to understand its exact
semantics months later.

So my first answer is: disallow FP types for iota(). I know this probably will
not happen, so let's see. This is what the arange() function of the Python good
numpy library gives for those intervals:

>>> from numpy import arange
>>> arange(0.0, 1.0, 0.3)
array([ 0. ,  0.3,  0.6,  0.9])
>>> arange(0.0, 1.0, 0.3)
array([ 0. ,  0.3,  0.6,  0.9])


So I presume your iotas should give:

iota!"(]"(0.0, 1.0, 0.3)
==>
[0.3; 0.6; 0.9]

iota!"()"(0.0, 1.0, 0.3)
==>
[0.3; 0.6; 0.9]

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