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  1. // -*- C++ -*-
  2.  
  3. // Copyright (C) 2005-2013 Free Software Foundation, Inc.
  4. //
  5. // This file is part of the GNU ISO C++ Library.  This library is free
  6. // software; you can redistribute it and/or modify it under the terms
  7. // of the GNU General Public License as published by the Free Software
  8. // Foundation; either version 3, or (at your option) any later
  9. // version.
  10.  
  11. // This library is distributed in the hope that it will be useful, but
  12. // WITHOUT ANY WARRANTY; without even the implied warranty of
  13. // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14. // General Public License for more details.
  15.  
  16. // Under Section 7 of GPL version 3, you are granted additional
  17. // permissions described in the GCC Runtime Library Exception, version
  18. // 3.1, as published by the Free Software Foundation.
  19.  
  20. // You should have received a copy of the GNU General Public License and
  21. // a copy of the GCC Runtime Library Exception along with this program;
  22. // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23. // <http://www.gnu.org/licenses/>.
  24.  
  25. // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  26.  
  27. // Permission to use, copy, modify, sell, and distribute this software
  28. // is hereby granted without fee, provided that the above copyright
  29. // notice appears in all copies, and that both that copyright notice
  30. // and this permission notice appear in supporting documentation. None
  31. // of the above authors, nor IBM Haifa Research Laboratories, make any
  32. // representation about the suitability of this software for any
  33. // purpose. It is provided "as is" without express or implied
  34. // warranty.
  35.  
  36. /**
  37.  * @file sample_update_policy.hpp
  38.  * Contains a sample policy for list update containers.
  39.  */
  40.  
  41. #ifndef PB_DS_SAMPLE_UPDATE_POLICY_HPP
  42. #define PB_DS_SAMPLE_UPDATE_POLICY_HPP
  43.  
  44. namespace __gnu_pbds
  45. {
  46.   /// A sample list-update policy.
  47.   struct sample_update_policy
  48.   {
  49.     /// Default constructor.
  50.     sample_update_policy();
  51.  
  52.     /// Copy constructor.
  53.     sample_update_policy(const sample_update_policy&);
  54.  
  55.     /// Swaps content.
  56.     inline void
  57.     swap(sample_update_policy& other);
  58.  
  59.   protected:
  60.     /// Metadata on which this functor operates.
  61.     typedef some_metadata_type metadata_type;
  62.  
  63.     /// Creates a metadata object.
  64.     metadata_type
  65.     operator()() const;
  66.  
  67.     /// Decides whether a metadata object should be moved to the front
  68.     /// of the list. A list-update based containers object will call
  69.     /// this method to decide whether to move a node to the front of
  70.     /// the list. The method shoule return true if the node should be
  71.     /// moved to the front of the list.
  72.     bool
  73.     operator()(metadata_reference) const;
  74.   };
  75. }
  76. #endif
  77.