On 1/22/15 11:50 AM, H. S. Teoh via Digitalmars-d wrote:
There's an undocumented function (2 overloads) called topNIndex that's
still sitting in std.algorithm.package, 'cos I have no idea what it does
and where it belongs.

1) Do we still want this function?

Yes.

2) There's a bunch of dead code that has been commented out since 2009,
including a function named topNIndexImpl. Does that mean that topNIndex
is also dead code?

topNIndex is supposed to be public.

3) What is this function supposed to do? (OK OK, I can just read the
code, but I figured it's faster to ask here. :-P)

void topNIndex(
    alias less = "a < b",
    SwapStrategy ss = SwapStrategy.unstable,
Range, RangeIndex)(Range r, RangeIndex index, SortOutput sorted = SortOutput.no)
if (isIntegral!(ElementType!(RangeIndex)));

It stores the indices of the top `index.length` elements of `r` in `index`, without modifying `r`.

4) Should we keep it, or should we chuck it?

Keep.


Andrei

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