| /*============================================================================= | |
| Copyright (c) 2001-2011 Hartmut Kaiser | |
| Copyright (c) 2001-2011 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(BOOST_SPIRIT_ANY_IF_MARCH_30_2007_1220PM) | |
| #define BOOST_SPIRIT_ANY_IF_MARCH_30_2007_1220PM | |
| #if defined(_MSC_VER) | |
| #pragma once | |
| #endif | |
| #include <boost/fusion/include/equal_to.hpp> | |
| #include <boost/fusion/include/next.hpp> | |
| #include <boost/fusion/include/deref.hpp> | |
| #include <boost/fusion/include/value_of.hpp> | |
| #include <boost/fusion/include/begin.hpp> | |
| #include <boost/fusion/include/end.hpp> | |
| #include <boost/fusion/include/is_sequence.hpp> | |
| #include <boost/fusion/include/any.hpp> | |
| #include <boost/spirit/home/support/unused.hpp> | |
| #include <boost/mpl/bool.hpp> | |
| #include <boost/mpl/apply.hpp> | |
| #include <boost/mpl/if.hpp> | |
| #include <boost/mpl/identity.hpp> | |
| #include <boost/mpl/and.hpp> | |
| #include <boost/mpl/not.hpp> | |
| namespace boost { namespace spirit | |
| { | |
| /////////////////////////////////////////////////////////////////////////// | |
| // This is a special version for a binary fusion::any. The predicate | |
| // is used to decide whether to advance the second iterator or not. | |
| // This is needed for sequences containing components with unused | |
| // attributes. The second iterator is advanced only if the attribute | |
| // of the corresponding component iterator is not unused. | |
| /////////////////////////////////////////////////////////////////////////// | |
| namespace detail | |
| { | |
| /////////////////////////////////////////////////////////////////////// | |
| template <typename Iterator, typename Pred> | |
| struct apply_predicate | |
| : mpl::apply1<Pred, typename fusion::result_of::value_of<Iterator>::type> | |
| {}; | |
| /////////////////////////////////////////////////////////////////////// | |
| // if the predicate is true, attribute_next returns next(Iterator2), | |
| // otherwise Iterator2 | |
| namespace result_of | |
| { | |
| template < | |
| typename Iterator1, typename Iterator2, typename Last2 | |
| , typename Pred> | |
| struct attribute_next | |
| { | |
| typedef mpl::and_< | |
| apply_predicate<Iterator1, Pred> | |
| , mpl::not_<fusion::result_of::equal_to<Iterator2, Last2> > | |
| > pred; | |
| typedef typename | |
| mpl::eval_if< | |
| pred | |
| , fusion::result_of::next<Iterator2> | |
| , mpl::identity<Iterator2> | |
| >::type | |
| type; | |
| template <typename Iterator> | |
| static type | |
| call(Iterator const& i, mpl::true_) | |
| { | |
| return fusion::next(i); | |
| } | |
| template <typename Iterator> | |
| static type | |
| call(Iterator const& i, mpl::false_) | |
| { | |
| return i; | |
| } | |
| template <typename Iterator> | |
| static type | |
| call(Iterator const& i) | |
| { | |
| return call(i, pred()); | |
| } | |
| }; | |
| } | |
| template < | |
| typename Pred, typename Iterator1, typename Last2 | |
| , typename Iterator2> | |
| inline typename | |
| result_of::attribute_next<Iterator1, Iterator2, Last2, Pred | |
| >::type const | |
| attribute_next(Iterator2 const& i) | |
| { | |
| return result_of::attribute_next< | |
| Iterator1, Iterator2, Last2, Pred>::call(i); | |
| } | |
| /////////////////////////////////////////////////////////////////////// | |
| // if the predicate is true, attribute_value returns deref(Iterator2), | |
| // otherwise unused | |
| namespace result_of | |
| { | |
| template < | |
| typename Iterator1, typename Iterator2, typename Last2 | |
| , typename Pred> | |
| struct attribute_value | |
| { | |
| typedef mpl::and_< | |
| apply_predicate<Iterator1, Pred> | |
| , mpl::not_<fusion::result_of::equal_to<Iterator2, Last2> > | |
| > pred; | |
| typedef typename | |
| mpl::eval_if< | |
| pred | |
| , fusion::result_of::deref<Iterator2> | |
| , mpl::identity<unused_type const> | |
| >::type | |
| type; | |
| template <typename Iterator> | |
| static type | |
| call(Iterator const& i, mpl::true_) | |
| { | |
| return fusion::deref(i); | |
| } | |
| template <typename Iterator> | |
| static type | |
| call(Iterator const&, mpl::false_) | |
| { | |
| return unused; | |
| } | |
| template <typename Iterator> | |
| static type | |
| call(Iterator const& i) | |
| { | |
| return call(i, pred()); | |
| } | |
| }; | |
| } | |
| template < | |
| typename Pred, typename Iterator1, typename Last2 | |
| , typename Iterator2> | |
| inline typename | |
| result_of::attribute_value<Iterator1, Iterator2, Last2, Pred | |
| >::type | |
| attribute_value(Iterator2 const& i) | |
| { | |
| return result_of::attribute_value< | |
| Iterator1, Iterator2, Last2, Pred>::call(i); | |
| } | |
| /////////////////////////////////////////////////////////////////////// | |
| template < | |
| typename Pred, typename First1, typename Last1, typename First2 | |
| , typename Last2, typename F> | |
| inline bool | |
| any_if (First1 const&, First2 const&, Last1 const&, Last2 const& | |
| , F const&, mpl::true_) | |
| { | |
| return false; | |
| } | |
| template < | |
| typename Pred, typename First1, typename Last1, typename First2 | |
| , typename Last2, typename F> | |
| inline bool | |
| any_if (First1 const& first1, First2 const& first2, Last1 const& last1 | |
| , Last2 const& last2, F& f, mpl::false_) | |
| { | |
| return f(*first1, attribute_value<Pred, First1, Last2>(first2)) || | |
| detail::any_if<Pred>( | |
| fusion::next(first1) | |
| , attribute_next<Pred, First1, Last2>(first2) | |
| , last1, last2 | |
| , f | |
| , fusion::result_of::equal_to< | |
| typename fusion::result_of::next<First1>::type, Last1>()); | |
| } | |
| } | |
| template <typename Pred, typename Sequence1, typename Sequence2, typename F> | |
| inline bool | |
| any_if(Sequence1 const& seq1, Sequence2& seq2, F f, Pred) | |
| { | |
| return detail::any_if<Pred>( | |
| fusion::begin(seq1), fusion::begin(seq2) | |
| , fusion::end(seq1), fusion::end(seq2) | |
| , f | |
| , fusion::result_of::equal_to< | |
| typename fusion::result_of::begin<Sequence1>::type | |
| , typename fusion::result_of::end<Sequence1>::type>()); | |
| } | |
| template <typename Pred, typename Sequence, typename F> | |
| inline bool | |
| any_if(Sequence const& seq, unused_type const, F f, Pred) | |
| { | |
| return fusion::any(seq, f); | |
| } | |
| }} | |
| #endif | |