Am 03.12.24 um 12:47 schrieb Ivan Matek via Boost:
And you never do this
boost::hash2::hash_append( h, {}, v.x ); boost::hash2::hash_append( h, {}, v.y ); boost::hash2::hash_append( h, {}, v.z );
You do this instead
boost::hash2::hash_append( h, f, v.x ); boost::hash2::hash_append( h, f, v.y ); boost::hash2::hash_append( h, f, v.z );
Yes, but then again I am passing f multiple times. I don't want it to sound like I am making a big deal out of this, I can just do something like(and I actually use this idiom a lot) const auto append = [&] (const auto& val){hash_append (h, f, val);} and use that "partially applied" helper, in case I actually need to do hash_append multiple times. I think there is space for such a helper: boost::hash2::hasher append(h, f); // Or ...::hasher append(h) for default flavor append(v.x); append(v.y); append(v.z);
As the equivalent for the above sequence. Basically make your lambda available as a named type. That might make it easier given that the flavor at the 2nd cannot be defaulted.