On Friday, 4 December 2015 at 20:01:10 UTC, Jacob Carlborg wrote:
On 2015-12-04 17:37, Andrei Alexandrescu wrote:
Like "tail" in Unix. Given a range R r and a number size_t n,
return a
TakeExactly!R that's r at no more than n steps from its end:
TakeExactly!R advanceWithin(R)(R r, size_t n)
if (isForwardRange!R);
Invariant:
assert(r.advanceWithin(n).length <= n);
Implementation would send a scout range ahead, etc.
I didn't file an issue for it, but it's a great function to
have.
retro + take?
+ retro to turn it back the normal way?
Also, I think this'd work?
return r.takeExactly(r.walkLength - n);
It wouldn't be particularly efficient though I wouldn't think -
as you'd need to walk the whole range to find it's length.
r.retro.take(n).retro seems like the easiest fit.
