Hi Russel --
> e.g. x..y. I wonder though that given 0 is not a legal index, the type
> of the array of zero length could be denoted [0] real, but then that
> may ruin the consistency of the idea of a range and it's use.
0 is a legal index in Chapel. For example:
var A: [-3..3] real;
Defines an array whose indices are -3, -2, -1, 0, 1, 2, 3.
Any range in Chapel whose low bound is greater than its high is empty.
Thus, as Mike alludes to, other empty ranges include:
var A: [2..1] real;
var B: [100..1] real;
var C: [n+1..n] real;
Thus, the interpretation of:
var D: [1..0] real;
as empty is not leaning on anything from Python. It's simple a case where
the low bound exceeds the high bound.
(Vaguely related: To count down in Chapel one uses '1..10 by -1', not
'10..1).
-Brad
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