1 | |
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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: max_element.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/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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