aldanor:
Is there an efficient method to remove elements with multiple
(compile-time-unknown) indices from an array? I currently do
something like
if (!index.empty)
foreach (i; index.sort.reverse)
a = a.remove(i);
... which looks a bit awkward.
Do not forget to add the () after the sort, otherwise you call
the deprecated, buggy and slow built-in sort.
reverse is another deprecated built-in, so use "retro".
The first "if" is not much useful, trying to sort an empty array
will not wast much time.
foreach (i; index.sort().retro)
a = a.remove(i);
In alternative you can also invert the sorting cmp (untested):
foreach (i; index.sort!q{a > b})
a = a.remove(i);
If you have to remove just few items in-place, that's the way to
do it. In future I hope we'll have a better remove function in
Phobos (but it's not hard to write).
Another solution is to filter the array a. If you have the
indexes, you can zip a with the indexes, and then filter, map to
extract just the items and use copy() to work in place, but it's
not nice-looking code.
Bye,
bearophile
