Subject: Re: [boost] [hash] Extract module from functional + std::hash_combine
From: Daniel James (dnljms_at_[hidden])
Date: 2017-12-19 16:47:22
On 19 December 2017 at 16:14, Peter Dimov via Boost
> Daniel James wrote:
>> But it's possible that the next standard will include 'hash_combine', as
>> well as functions using variadic arguments:
> Nico Josuttis has been pushing for std::hash_combine - his latest is
Ah, I got the wrong one. The problem with this paper is that
hash_combine is defined differently to ours, so if it's added to the
standard, it's going to make it awkward for me to follow it.
> and I vaguely remember it being accepted by LEWG at the last meeting, but at
> the moment I'm not convinced that this is the right way forward.
I heard that on Slack after the last meeting. That's why I was picking
up on this paper, and not the others.
> The alternatives proposed by Howard Hinnant and by Google are better.
IIUC the Josuttis paper is intended as a stop-gap that won't get in
the way of a better proposal. But it's a bit half-baked as there are a
lot of use cases it doesn't have good support for, such as hashing
ranges or conditionally hashing a member.
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