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| 2 | #ifndef BOOST_MPL_MAX_ELEMENT_HPP_INCLUDED |
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| 3 | #define BOOST_MPL_MAX_ELEMENT_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 | // $Id$ |
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| 14 | // $Date$ |
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| 15 | // $Revision$ |
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| 16 | |
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| 17 | #include <boost/mpl/less.hpp> |
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| 18 | #include <boost/mpl/iter_fold.hpp> |
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| 19 | #include <boost/mpl/begin_end.hpp> |
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| 20 | #include <boost/mpl/if.hpp> |
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| 21 | #include <boost/mpl/deref.hpp> |
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| 22 | #include <boost/mpl/apply.hpp> |
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| 23 | #include <boost/mpl/aux_/common_name_wknd.hpp> |
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| 24 | #include <boost/mpl/aux_/na_spec.hpp> |
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| 25 | |
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| 26 | namespace boost { namespace mpl { |
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| 27 | |
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| 28 | BOOST_MPL_AUX_COMMON_NAME_WKND(max_element) |
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| 29 | |
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| 30 | namespace aux { |
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| 31 | |
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| 32 | template< typename Predicate > |
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| 33 | struct select_max |
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| 34 | { |
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| 35 | template< typename OldIterator, typename Iterator > |
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| 36 | struct apply |
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| 37 | { |
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| 38 | typedef typename apply2< |
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| 39 | Predicate |
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| 40 | , typename deref<OldIterator>::type |
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| 41 | , typename deref<Iterator>::type |
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| 42 | >::type condition_; |
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| 43 | |
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| 44 | typedef typename if_< |
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| 45 | condition_ |
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| 46 | , Iterator |
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| 47 | , OldIterator |
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| 48 | >::type type; |
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| 49 | }; |
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| 50 | }; |
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| 51 | |
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| 52 | } // namespace aux |
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| 53 | |
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| 54 | |
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| 55 | template< |
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| 56 | typename BOOST_MPL_AUX_NA_PARAM(Sequence) |
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| 57 | , typename Predicate = less<_,_> |
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| 58 | > |
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| 59 | struct max_element |
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| 60 | : iter_fold< |
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| 61 | Sequence |
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| 62 | , typename begin<Sequence>::type |
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| 63 | , protect< aux::select_max<Predicate> > |
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| 64 | > |
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| 65 | { |
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| 66 | }; |
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| 67 | |
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| 68 | BOOST_MPL_AUX_NA_SPEC(1, max_element) |
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| 69 | |
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| 70 | }} |
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| 71 | |
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| 72 | #endif // BOOST_MPL_MAX_ELEMENT_HPP_INCLUDED |
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| 73 | |
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