| /*============================================================================= |
| Copyright (c) 2001-2006 Joel de Guzman |
| |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| ==============================================================================*/ |
| #if !defined(FUSION_ERASE_07232005_0534) |
| #define FUSION_ERASE_07232005_0534 |
| |
| #include <boost/fusion/iterator/equal_to.hpp> |
| #include <boost/fusion/iterator/mpl/convert_iterator.hpp> |
| #include <boost/fusion/container/vector/vector10.hpp> |
| #include <boost/fusion/view/joint_view/joint_view.hpp> |
| #include <boost/fusion/view/iterator_range/iterator_range.hpp> |
| #include <boost/fusion/support/detail/as_fusion_element.hpp> |
| #include <boost/fusion/sequence/intrinsic/begin.hpp> |
| #include <boost/fusion/sequence/intrinsic/end.hpp> |
| #include <boost/fusion/adapted/mpl/mpl_iterator.hpp> |
| |
| namespace boost { namespace fusion |
| { |
| namespace result_of |
| { |
| template <typename Sequence, typename First> |
| struct compute_erase_last // put this in detail!!! |
| { |
| typedef typename result_of::end<Sequence>::type seq_last_type; |
| typedef typename convert_iterator<First>::type first_type; |
| typedef typename |
| mpl::if_< |
| result_of::equal_to<first_type, seq_last_type> |
| , first_type |
| , typename result_of::next<first_type>::type |
| >::type |
| type; |
| |
| static type |
| call(First const& first, mpl::false_) |
| { |
| return fusion::next(convert_iterator<First>::call(first)); |
| } |
| |
| static type |
| call(First const& first, mpl::true_) |
| { |
| return convert_iterator<First>::call(first); |
| } |
| |
| static type |
| call(First const& first) |
| { |
| return call(first, result_of::equal_to<first_type, seq_last_type>()); |
| } |
| }; |
| |
| template < |
| typename Sequence |
| , typename First |
| , typename Last = typename compute_erase_last<Sequence, First>::type> |
| struct erase |
| { |
| typedef typename result_of::begin<Sequence>::type seq_first_type; |
| typedef typename result_of::end<Sequence>::type seq_last_type; |
| BOOST_STATIC_ASSERT((!result_of::equal_to<seq_first_type, seq_last_type>::value)); |
| |
| typedef typename convert_iterator<First>::type first_type; |
| typedef typename convert_iterator<Last>::type last_type; |
| typedef iterator_range<seq_first_type, first_type> left_type; |
| typedef iterator_range<last_type, seq_last_type> right_type; |
| typedef joint_view<left_type, right_type> type; |
| }; |
| } |
| |
| template <typename Sequence, typename First> |
| typename result_of::erase<Sequence const, First>::type |
| erase(Sequence const& seq, First const& first) |
| { |
| typedef result_of::erase<Sequence const, First> result_of; |
| typedef typename result_of::left_type left_type; |
| typedef typename result_of::right_type right_type; |
| typedef typename result_of::type result_type; |
| |
| left_type left( |
| fusion::begin(seq) |
| , convert_iterator<First>::call(first)); |
| right_type right( |
| fusion::result_of::compute_erase_last<Sequence const, First>::call(first) |
| , fusion::end(seq)); |
| return result_type(left, right); |
| } |
| |
| template <typename Sequence, typename First, typename Last> |
| typename result_of::erase<Sequence const, First, Last>::type |
| erase(Sequence const& seq, First const& first, Last const& last) |
| { |
| typedef result_of::erase<Sequence const, First, Last> result_of; |
| typedef typename result_of::left_type left_type; |
| typedef typename result_of::right_type right_type; |
| typedef typename result_of::type result_type; |
| |
| left_type left(fusion::begin(seq), first); |
| right_type right(last, fusion::end(seq)); |
| return result_type(left, right); |
| } |
| }} |
| |
| #endif |
| |