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    Copyright (c) 2011 Eric Niebler

    Distributed under the Boost Software License, Version 1.0. (See accompanying 
    file LICENSE_1_0.txt or copy at

#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_const.hpp>

// Forward declaration of find_if algorithm
namespace boost { namespace fusion
    namespace result_of
        template <typename Sequence, typename Pred>
        struct find_if;

    template <typename Pred, typename Sequence>
          , result_of::find_if<Sequence, Pred>
    find_if(Sequence& seq);

    template <typename Pred, typename Sequence>
    typename result_of::find_if<Sequence const, Pred>::type const
    find_if(Sequence const& seq);