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| 2 | #ifndef BOOST_MPL_INSERT_IMPL_HPP_INCLUDED |
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| 3 | #define BOOST_MPL_INSERT_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 | // $Source: /cvsroot/boost/boost/boost/mpl/aux_/insert_impl.hpp,v $ |
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| 14 | // $Date: 2004/09/02 15:40:43 $ |
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| 15 | // $Revision: 1.4 $ |
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| 16 | |
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| 17 | #include <boost/mpl/reverse_fold.hpp> |
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| 18 | #include <boost/mpl/iterator_range.hpp> |
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| 19 | #include <boost/mpl/clear.hpp> |
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| 20 | #include <boost/mpl/push_front.hpp> |
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| 21 | #include <boost/mpl/aux_/na_spec.hpp> |
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| 22 | #include <boost/mpl/aux_/traits_lambda_spec.hpp> |
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| 23 | #include <boost/type_traits/is_same.hpp> |
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| 24 | |
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| 25 | namespace boost { namespace mpl { |
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| 26 | |
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| 27 | // default implementation; conrete sequences might override it by |
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| 28 | // specializing either the 'insert_impl' or the primary 'insert' template |
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| 29 | |
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| 30 | template< typename Tag > |
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| 31 | struct insert_impl |
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| 32 | { |
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| 33 | template< |
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| 34 | typename Sequence |
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| 35 | , typename Pos |
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| 36 | , typename T |
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| 37 | > |
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| 38 | struct apply |
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| 39 | { |
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| 40 | typedef iterator_range< |
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| 41 | typename begin<Sequence>::type |
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| 42 | , Pos |
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| 43 | > first_half_; |
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| 44 | |
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| 45 | typedef iterator_range< |
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| 46 | Pos |
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| 47 | , typename end<Sequence>::type |
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| 48 | > second_half_; |
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| 49 | |
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| 50 | typedef typename reverse_fold< |
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| 51 | second_half_ |
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| 52 | , typename clear<Sequence>::type |
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| 53 | , push_front<_,_> |
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| 54 | >::type half_sequence_; |
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| 55 | |
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| 56 | typedef typename reverse_fold< |
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| 57 | first_half_ |
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| 58 | , typename push_front<half_sequence_,T>::type |
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| 59 | , push_front<_,_> |
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| 60 | >::type type; |
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| 61 | }; |
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| 62 | }; |
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| 63 | |
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| 64 | BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(3,insert_impl) |
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| 65 | |
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| 66 | }} |
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| 67 | |
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| 68 | #endif // BOOST_MPL_INSERT_IMPL_HPP_INCLUDED |
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