On Tue, Dec 3, 2024 at 2:25 PM Peter Dimov via Boost <boost@lists.boost.org> wrote:
I already said this, but let's do it again: the flavor can't be defaulted on purpose, because you shouldn't be defaulting it, as it's a mistake to do so.
You need to use the flavor passed as an argument, not the default one.
I understand that sometimes you are just part of hashing process, same as
sometimes with formatting or parsing you are just part of pipeline. I wonder if we could have existing: template<class Hash, class Flavor> friend void tag_invoke( boost::hash2::hash_append_tag const&, Hash& h, Flavor const& f, X const& v ) { boost::hash2::hash_append(h, f, v.a); boost::hash2::hash_append(h, f, v.b); } and also this: template<class SimpleHash> friend void tag_invoke( boost::hash2::simple_hash_append_tag const&, SimpleHash& h, X const& v ) { h.append(v.a); h.append(v.b); }