Re: [boost] Evolving Boost.ContainerHash

Vinnie Falco wrote:

On Tue, Oct 12, 2021 at 4:26 PM Peter Dimov via Boost wrote:

...

template<class T> void hash_combine( size_t& seed, T const& v )

In principle it sounds like an improvement, but what about the paper "Types Don't Know #?" (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3980.html)

The paper shows empirical evidence that hash_combine has poor collision properties when composing hash functions.

...

What happens with hash_append from the paper?

As you well know, what happens with hash_append from the paper is that it has been sitting in https://github.com/pdimov/hash2 for years now while I was promising to finish the library and submit it to Boost. I'm still doing that. (Promising, I mean.)