1 | /*=============================================================================
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2 | Copyright (c) 2003 Joel de Guzman
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3 |
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4 | Use, modification and distribution is subject to the Boost Software
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5 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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6 | http://www.boost.org/LICENSE_1_0.txt)
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7 | ==============================================================================*/
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8 | #if !defined(FUSION_SEQUENCE_DETAIL_TUPLE_AT_TRAITS_HPP)
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9 | #define FUSION_SEQUENCE_DETAIL_TUPLE_AT_TRAITS_HPP
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10 |
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11 | #include <boost/spirit/fusion/detail/config.hpp>
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12 | #include <boost/spirit/fusion/detail/access.hpp>
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13 | #include <boost/spirit/fusion/sequence/detail/tuple_access_result.hpp>
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14 |
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15 | namespace boost { namespace fusion
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16 | {
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17 | struct tuple_tag;
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18 |
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19 | namespace detail
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20 | {
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21 | template <int N>
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22 | struct tuple_access;
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23 | }
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24 |
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25 | namespace detail
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26 | {
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27 | template <typename Sequence, int N>
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28 | struct tuple_at_impl
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29 | {
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30 | typedef BOOST_DEDUCED_TYPENAME
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31 | boost::fusion::detail::tuple_access_result<Sequence, N>::type
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32 | type;
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33 |
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34 | static type
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35 | call(Sequence& t);
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36 | };
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37 |
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38 | template <typename Sequence, int N>
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39 | inline typename tuple_at_impl<Sequence, N>::type
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40 | tuple_at_impl<Sequence, N>::call(Sequence& t)
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41 | {
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42 | return detail::tuple_access<N>::get(t);
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43 | }
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44 | }
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45 |
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46 | namespace meta
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47 | {
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48 | template <typename Tag>
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49 | struct at_impl;
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50 |
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51 | template <>
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52 | struct at_impl<tuple_tag>
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53 | {
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54 | template <typename Sequence, int N>
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55 | struct apply : detail::tuple_at_impl<Sequence, N> {};
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56 | };
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57 | }
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58 | }}
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59 |
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60 | #endif
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