[Boost-users] nest mpl::lambda

Subject: [Boost-users] nest mpl::lambda
From: Niitsuma Hirotaka (hirotaka.niitsuma_at_[hidden])
Date: 2013-02-23 05:32:52

I would like to use mpl::lambda in nest.

In this case works fine.
---------
  typedef boost::mpl::lambda<boost::mpl::max<boost::mpl::_1,boost::mpl::_2>
> my_max;
  typedef boost::mpl::fold<
      boost::mpl::vector_c<int,1,7,0,-2,5,-1>
    , boost::mpl::int_<6>
    //, boost::mpl::max<boost::mpl::_1,boost::mpl::_2>
    , my_max
    >::type r2;

  BOOST_MPL_ASSERT(( boost::is_same< r2, boost::mpl::integral_c<int, 7> > ));
---------

However

---------

  typedef boost::mpl::lambda<
    boost::mpl::fold<
      boost::mpl::_1
      ,boost::mpl::front<boost::mpl::_1>
      ,my_max
      >::type >::type my_max_types;

  typedef my_max_types::apply<boost::mpl::vector_c<int,1,7,0,-2,5,-1>
>::type r3;

  BOOST_MPL_ASSERT(( boost::is_same< r3, boost::mpl::integral_c<int, 7> > ));
  ///error => becomes boost::mpl::integral_c<int, 1>
---------

How to define such nest lambda in mpl?