[Boost-users] [fusion] result_of

Subject: [Boost-users] [fusion] result_of
From: Robert Ramey (ramey_at_[hidden])
Date: 2011-05-08 13:40:50

I'm very interested in fusion and have been experimenting with it.

There is one thing that is currently confusing me.  (OK more than one 
thing).
The documentation a typical function at 
.../fusion/sequence/concepts/associative_sequence.html
shows valid expression

has_key<K>(s)

returning type

result_of::has_key<S, K>::type

which is OK by me.  But why doesn't fusion use:

#include <boost/result_of.hpp>
then use boost::result_of<has_key<K>(S)>::type

which would seem to me to reduce the size of fusion
(and the docs) by around 50%.  What am I missing
here?

Robert Ramey