[boost] hash_fwd dependency (Was: New dependency report)

Subject: [boost] hash_fwd dependency (Was: New dependency report)
From: Peter Dimov (lists_at_[hidden])
Date: 2014-06-07 12:41:58

Antony Polukhin wrote:
> Would it be good to move a single <boost/functional/hash/hash_fwd.hpp> 
> header into the Boost.Core?
> This header depends only on Boost.Config. It adds dependency to a whole 
> Boost.Functional library for the following libraries: array, container, 
> filesystem, multiindex, thread, type_index, variant.

While the general subject of forwarding headers still deserves 
consideration, in this specific case I wonder if moving funcional/hash into 
its own 'hash' module would not alleviate most of the problem.

I know that std::hash is in <functional>, but it still feels wrong having 
boost::hash in boost/functional/hash.hpp.