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  1.  
  2. #ifndef BOOST_MPL_MAX_ELEMENT_HPP_INCLUDED
  3. #define BOOST_MPL_MAX_ELEMENT_HPP_INCLUDED
  4.  
  5. // Copyright Aleksey Gurtovoy 2000-2004
  6. //
  7. // Distributed under the Boost Software License, Version 1.0.
  8. // (See accompanying file LICENSE_1_0.txt or copy at
  9. // http://www.boost.org/LICENSE_1_0.txt)
  10. //
  11. // See http://www.boost.org/libs/mpl for documentation.
  12.  
  13. // $Id$
  14. // $Date$
  15. // $Revision$
  16.  
  17. #include <boost/mpl/less.hpp>
  18. #include <boost/mpl/iter_fold.hpp>
  19. #include <boost/mpl/begin_end.hpp>
  20. #include <boost/mpl/if.hpp>
  21. #include <boost/mpl/deref.hpp>
  22. #include <boost/mpl/apply.hpp>
  23. #include <boost/mpl/aux_/common_name_wknd.hpp>
  24. #include <boost/mpl/aux_/na_spec.hpp>
  25.  
  26. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace mpl {
  27.  
  28. BOOST_MPL_AUX_COMMON_NAME_WKND(max_element)
  29.  
  30. namespace aux {
  31.  
  32. template< typename Predicate >
  33. struct select_max
  34. {
  35.     template< typename OldIterator, typename Iterator >
  36.     struct apply
  37.     {
  38.         typedef typename apply2<
  39.               Predicate
  40.             , typename deref<OldIterator>::type
  41.             , typename deref<Iterator>::type
  42.             >::type condition_;
  43.  
  44.         typedef typename if_<
  45.               condition_
  46.             , Iterator
  47.             , OldIterator
  48.             >::type type;
  49.     };
  50. };
  51.  
  52. } // namespace aux
  53.  
  54.  
  55. template<
  56.       typename BOOST_MPL_AUX_NA_PARAM(Sequence)
  57.     , typename Predicate = less<_,_>
  58.     >
  59. struct max_element
  60.     : iter_fold<
  61.           Sequence
  62.         , typename begin<Sequence>::type
  63.         , protect< aux::select_max<Predicate> >
  64.         >
  65. {
  66. };
  67.  
  68. BOOST_MPL_AUX_NA_SPEC(1, max_element)
  69.  
  70. }}
  71.  
  72. #endif // BOOST_MPL_MAX_ELEMENT_HPP_INCLUDED
  73.  
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