[Boost-users] [fusion] how to get the tuple of min values of 2 tuples whatever their length?

Subject: [Boost-users] [fusion] how to get the tuple of min values of 2 tuples whatever their length?
From: Frédéric Bron (frederic.bron_at_[hidden])
Date: 2013-07-17 07:17:35

I have two tuples:
typedef boost::tuple<double, int, std::string> Key;
Key k1, k2;

I would like to get the tuple of the min values for each corresponding
value between k1 and k2:
Key min=Key(std::min(k1.get<0>(), k2.get<0>()), std::min(k1.get<1>(),
k2.get<1>()), std::min(k1.get<2>(), k2.get<2>()));

but I do not know the length of the tuple so I am looking for a
generic algorithm...
Is this possible with boost::fusion or boost::mpl?

I have tried with boost::fusion::accumulate but I need to now in the
functor the index of the value that is currently accessed to compare
to the right one in k1.

Frédéric