2 #ifndef BOOST_MPL_AUX_FRONT_IMPL_HPP_INCLUDED
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3 #define BOOST_MPL_AUX_FRONT_IMPL_HPP_INCLUDED
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5 // Copyright Aleksey Gurtovoy 2000-2004
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7 // Distributed under the Boost Software License, Version 1.0.
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8 // (See accompanying file LICENSE_1_0.txt or copy at
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9 // http://www.boost.org/LICENSE_1_0.txt)
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11 // See http://www.boost.org/libs/mpl for documentation.
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13 // $Id: front_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
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14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
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15 // $Revision: 49267 $
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17 #include <boost/mpl/front_fwd.hpp>
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18 #include <boost/mpl/begin_end.hpp>
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19 #include <boost/mpl/deref.hpp>
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20 #include <boost/mpl/aux_/traits_lambda_spec.hpp>
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22 namespace boost { namespace mpl {
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24 // default implementation; conrete sequences might override it by
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25 // specializing either the 'front_impl' or the primary 'front' template
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27 template< typename Tag >
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30 template< typename Sequence > struct apply
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32 typedef typename begin<Sequence>::type iter_;
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33 typedef typename deref<iter_>::type type;
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37 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1,front_impl)
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41 #endif // BOOST_MPL_AUX_FRONT_IMPL_HPP_INCLUDED
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