Proposal: add 'findLess' and variants to containers

Michael Craig mkscrg at
Thu Feb 16 21:14:38 CET 2012

Thanks for making this proposal, Twan. I've actually been meaning to make
the same proposal for the last few weeks. Before I understood the proposal
process (thanks again to Milan for filling me in) I made a pull request on
GitHub with an implementation of a `successor` function on IntMap (very
similar to your `findGreaterEqual`).

It shows that a more efficient implementation is available, which avoids
`splitLookup` and therefore `union`. (Disclaimer: I haven't run any
benchmarks to show that my internal implementation is actually faster.)

As I mention in that pull, these functions are useful for very practical
things like consistent hashing, etc.

Mike Craig

On Thu, Feb 16, 2012 at 2:37 PM, Johan Tibell <johan.tibell at>wrote:

> Hi,
> First, thanks for writing such a detailed proposal.
> I don't have strong feelings one way or the other. Like always I'm
> worried about API growth. How about performance? Can these functions
> be implemented efficiently outside the library?
> Since I don't feel strongly either way I'm fine with this if Milan and
> the community are.
> Cheers,
> Johan
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