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1 |
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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 |