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2 | #ifndef BOOST_MPL_LIST_AUX_FRONT_HPP_INCLUDED
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3 | #define BOOST_MPL_LIST_AUX_FRONT_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 | // $Source: /cvsroot/boost/boost/boost/mpl/vector/aux_/front.hpp,v $
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14 | // $Date: 2004/09/02 15:41:19 $
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15 | // $Revision: 1.4 $
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16 |
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17 | #include <boost/mpl/front_fwd.hpp>
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18 | #include <boost/mpl/vector/aux_/at.hpp>
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19 | #include <boost/mpl/vector/aux_/tag.hpp>
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20 | #include <boost/mpl/aux_/nttp_decl.hpp>
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21 | #include <boost/mpl/aux_/config/typeof.hpp>
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22 | #include <boost/mpl/aux_/config/ctps.hpp>
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23 |
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24 | namespace boost { namespace mpl {
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25 |
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26 | #if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
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27 |
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28 | template<>
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29 | struct front_impl< aux::vector_tag >
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30 | {
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31 | template< typename Vector > struct apply
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32 | : v_at<Vector,0>
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33 | {
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34 | };
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35 | };
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36 |
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37 | #else
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38 |
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39 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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40 |
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41 | template< BOOST_MPL_AUX_NTTP_DECL(long, n_) >
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42 | struct front_impl< aux::vector_tag<n_> >
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43 | {
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44 | template< typename Vector > struct apply
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45 | {
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46 | typedef typename Vector::item0 type;
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47 | };
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48 | };
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49 |
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50 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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51 |
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52 | #endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
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53 |
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54 | }}
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55 |
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56 | #endif // BOOST_MPL_LIST_AUX_FRONT_HPP_INCLUDED
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