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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_resize_policy.hpp
  38.  * Contains a sample resize policy for hash tables.
  39.  */
  40.  
  41. #ifndef PB_DS_SAMPLE_RESIZE_POLICY_HPP
  42. #define PB_DS_SAMPLE_RESIZE_POLICY_HPP
  43.  
  44. namespace __gnu_pbds
  45. {
  46.   /// A sample resize policy.
  47.   class sample_resize_policy
  48.   {
  49.   public:
  50.     /// Size type.
  51.     typedef std::size_t size_type;
  52.  
  53.     /// Default constructor.
  54.     sample_resize_policy();
  55.  
  56.     /// Copy constructor.
  57.     sample_range_hashing(const sample_resize_policy& other);
  58.  
  59.     /// Swaps content.
  60.     inline void
  61.     swap(sample_resize_policy& other);
  62.  
  63.   protected:
  64.     /// Notifies a search started.
  65.     inline void
  66.     notify_insert_search_start();
  67.  
  68.     /// Notifies a search encountered a collision.
  69.     inline void
  70.     notify_insert_search_collision();
  71.  
  72.     /// Notifies a search ended.
  73.     inline void
  74.     notify_insert_search_end();
  75.  
  76.     /// Notifies a search started.
  77.     inline void
  78.     notify_find_search_start();
  79.  
  80.     /// Notifies a search encountered a collision.
  81.     inline void
  82.     notify_find_search_collision();
  83.  
  84.     /// Notifies a search ended.
  85.     inline void
  86.     notify_find_search_end();
  87.  
  88.     /// Notifies a search started.
  89.     inline void
  90.     notify_erase_search_start();
  91.  
  92.     /// Notifies a search encountered a collision.
  93.     inline void
  94.     notify_erase_search_collision();
  95.  
  96.     /// Notifies a search ended.
  97.     inline void
  98.     notify_erase_search_end();
  99.  
  100.     /// Notifies an element was inserted.
  101.     inline void
  102.     notify_inserted(size_type num_e);
  103.  
  104.     /// Notifies an element was erased.
  105.     inline void
  106.     notify_erased(size_type num_e);
  107.  
  108.     /// Notifies the table was cleared.
  109.     void
  110.     notify_cleared();
  111.  
  112.     /// Notifies the table was resized to new_size.
  113.     void
  114.     notify_resized(size_type new_size);
  115.  
  116.     /// Queries whether a resize is needed.
  117.     inline bool
  118.     is_resize_needed() const;
  119.  
  120.     /// Queries what the new size should be.
  121.     size_type
  122.     get_new_size(size_type size, size_type num_used_e) const;
  123.   };
  124. }
  125. #endif
  126.