On Tuesday, 19 February 2013 at 16:46:36 UTC, bearophile wrote:
John Colvin:
I think the right design here is to return a bool[N].
...
There is significant opposition to any simd operators that
allocate. The reasoning is that they appear fast but are in
actual fact slow (for most normal size vectors, the allocation
would be much slower than the calculation itself).
I love the features of numpy and matlab etc. when it comes to
array operations, many of which allocate implicitly, but
Walter and others were quite adamant they they do not belong
in D, a position I've come to agree with.
Can't D allocate that bool[N] on the stack?
Bye,
bearophile
Perhaps it could, but it would be:
a) quite counter-intuitive. An operation between two normal, heap
allocated arrays generating a stack allocated array, with the
scoping rules that entails?
b) very easy to cause stack overflow in a way that would be
totally confusing to someone who wasn't aware of the
implementation.
