| 1 | /*============================================================================= |
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| 2 | Copyright (c) 2001-2003 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_TUPLE_ELEMENT_HPP) |
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| 9 | #define FUSION_SEQUENCE_TUPLE_ELEMENT_HPP |
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| 10 | |
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| 11 | #include <boost/spirit/fusion/sequence/value_at.hpp> |
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| 12 | |
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| 13 | namespace boost { namespace fusion |
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| 14 | { |
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| 15 | /////////////////////////////////////////////////////////////////////////// |
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| 16 | // |
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| 17 | // tuple_element metafunction |
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| 18 | // |
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| 19 | // Given a constant integer N and a Sequence, returns the |
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| 20 | // tuple element type at slot N. (N is a zero based index). Usage: |
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| 21 | // |
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| 22 | // tuple_element<N, Sequence>::type |
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| 23 | // |
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| 24 | // This metafunction is provided here for compatibility with the |
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| 25 | // tuples TR1 specification. This metafunction forwards to |
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| 26 | // meta::value_at_c<Sequence>. |
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| 27 | // |
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| 28 | /////////////////////////////////////////////////////////////////////////// |
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| 29 | template <int N, typename Sequence> |
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| 30 | struct tuple_element : meta::value_at_c<Sequence, N> {}; |
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| 31 | }} |
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| 32 | |
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| 33 | #endif |
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