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| 2 | #ifndef BOOST_MPL_AUX_BACK_IMPL_HPP_INCLUDED |
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| 3 | #define BOOST_MPL_AUX_BACK_IMPL_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 | // $Id: back_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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| 14 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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| 15 | // $Revision: 49267 $ |
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| 16 | |
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| 17 | #include <boost/mpl/begin_end.hpp> |
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| 18 | #include <boost/mpl/next_prior.hpp> |
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| 19 | #include <boost/mpl/deref.hpp> |
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| 20 | #include <boost/mpl/aux_/traits_lambda_spec.hpp> |
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| 21 | |
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| 22 | namespace boost { namespace mpl { |
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| 23 | |
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| 24 | // default implementation, requires at least bi-directional iterators; |
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| 25 | // conrete sequences might override it by specializing either the |
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| 26 | // 'back_impl' or the primary 'back' template |
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| 27 | |
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| 28 | template< typename Tag > |
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| 29 | struct back_impl |
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| 30 | { |
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| 31 | template< typename Sequence > struct apply |
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| 32 | { |
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| 33 | typedef typename end<Sequence>::type end_; |
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| 34 | typedef typename prior<end_>::type last_; |
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| 35 | typedef typename deref<last_>::type type; |
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| 36 | }; |
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| 37 | }; |
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| 38 | |
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| 39 | BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, back_impl) |
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| 40 | |
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| 41 | }} |
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| 42 | |
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| 43 | #endif // BOOST_MPL_AUX_BACK_IMPL_HPP_INCLUDED |
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