[Boost-users] [mpl] Where is at with default

Subject: [Boost-users] [mpl] Where is at with default
From: Agustín K-ballo Bergé (kaballo86_at_[hidden])
Date: 2009-10-16 02:16:13

I can't seem to find the `at` metafunction with a default value for
associative sequences. What should I include to use such metafunction
with a mpl::map ? Including <boost/mpl/at.hpp> is not enough, I get a
'too many templates arguments' when trying to do:

typename boost::mpl::at< State, R, L >::type

which I ended up doing like this:

typename boost::mpl::eval_if<
    typename boost::mpl::has_key< State, R >::type
  , boost::mpl::at< State, R >
  , boost::mpl::identity< L >
>::type

Thank you.-

Agustín K-ballo Bergé.-