| 1 | /*============================================================================= |
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| 2 | Copyright (c) 2001-2011 Joel de Guzman |
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| 3 | Copyright (c) 2005-2006 Dan Marsden |
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| 4 | |
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| 5 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 6 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 7 | ==============================================================================*/ |
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| 8 | #if !defined(BOOST_FUSION_AT_IMPL_31122005_1642) |
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| 9 | #define BOOST_FUSION_AT_IMPL_31122005_1642 |
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| 10 | |
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| 11 | #include <boost/fusion/support/config.hpp> |
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| 12 | #include <boost/mpl/at.hpp> |
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| 13 | |
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| 14 | namespace boost { namespace fusion |
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| 15 | { |
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| 16 | struct mpl_sequence_tag; |
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| 17 | |
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| 18 | namespace extension |
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| 19 | { |
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| 20 | template<typename Tag> |
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| 21 | struct at_impl; |
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| 22 | |
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| 23 | template <> |
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| 24 | struct at_impl<mpl_sequence_tag> |
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| 25 | { |
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| 26 | template <typename Sequence, typename N> |
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| 27 | struct apply |
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| 28 | { |
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| 29 | typedef typename mpl::at<Sequence, N>::type type; |
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| 30 | |
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| 31 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
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| 32 | static type |
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| 33 | call(Sequence) |
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| 34 | { |
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| 35 | return type(); |
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| 36 | } |
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| 37 | }; |
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| 38 | }; |
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| 39 | } |
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| 40 | }} |
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| 41 | |
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| 42 | #endif |
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| 43 | |
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