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2 #ifndef BOOST_MPL_AT_HPP_INCLUDED
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3 #define BOOST_MPL_AT_HPP_INCLUDED
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4
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5 // Copyright Aleksey Gurtovoy 2000-2004
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6 //
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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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10 //
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11 // See http://www.boost.org/libs/mpl for documentation.
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12
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13 // $Id$
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14 // $Date$
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15 // $Revision$
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16
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17 #include <boost/mpl/at_fwd.hpp>
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18 #include <boost/mpl/aux_/at_impl.hpp>
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19 #include <boost/mpl/long.hpp>
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20 #include <boost/mpl/sequence_tag.hpp>
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21 #include <boost/mpl/aux_/na_spec.hpp>
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22 #include <boost/mpl/aux_/lambda_support.hpp>
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23 #include <boost/mpl/aux_/nttp_decl.hpp>
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24
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25 namespace boost { namespace mpl {
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26
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27 template<
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28 typename BOOST_MPL_AUX_NA_PARAM(Sequence)
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29 , typename BOOST_MPL_AUX_NA_PARAM(N)
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30 >
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31 struct at
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32 : at_impl< typename sequence_tag<Sequence>::type >
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33 ::template apply< Sequence,N >
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34 {
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35 BOOST_MPL_AUX_LAMBDA_SUPPORT(2,at,(Sequence,N))
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36 };
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37
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38 template<
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39 typename Sequence
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40 , BOOST_MPL_AUX_NTTP_DECL(long, N)
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41 >
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42 struct at_c
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43 : at_impl< typename sequence_tag<Sequence>::type >
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44 ::template apply< Sequence,mpl::long_<N> >
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45 {
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46 };
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47
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48 BOOST_MPL_AUX_NA_SPEC(2, at)
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49
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50 }}
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51
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52 #endif // BOOST_MPL_AT_HPP_INCLUDED
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