Good project: stride() with constant stride value
Jonathan M Davis via Digitalmars-d
digitalmars-d at puremagic.com
Fri Mar 4 13:32:45 PST 2016
On Friday, 4 March 2016 at 16:45:42 UTC, Andrei Alexandrescu
wrote:
> Currently we have a very useful stride() function that allows
> spanning a random access range with a specified step, e.g. 0,
> 3, 6, 9, ... for step 3.
>
> I've run some measurements recently and it turns out a
> compile-time-known stride is a lot faster than a variable. So I
> was thinking to improve Stride(R) to take an additional
> parameter: Stride(R, size_t step = 0). If step is 0, then use a
> runtime-valued stride as until now. If nonzero, Stride should
> use that compile-time step.
>
> Takers?
IMHO, it would be cleaner to make them separate templates so that
we don't have to give some special meaning to step == 0. And if
it made sense for them to share their implementation, we could
still have a helper template that did the step == 0 so that it
was hidden from the user.
- Jonathan M Davis
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