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// -*- C++ -*- |
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// Copyright (C) 2005-2013 Free Software Foundation, Inc. |
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// |
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// This file is part of the GNU ISO C++ Library. This library is free |
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// software; you can redistribute it and/or modify it under the terms |
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// of the GNU General Public License as published by the Free Software |
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// Foundation; either version 3, or (at your option) any later |
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// version. |
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// This library is distributed in the hope that it will be useful, but |
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// WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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// General Public License for more details. |
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// Under Section 7 of GPL version 3, you are granted additional |
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// permissions described in the GCC Runtime Library Exception, version |
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// 3.1, as published by the Free Software Foundation. |
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// You should have received a copy of the GNU General Public License and |
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// a copy of the GCC Runtime Library Exception along with this program; |
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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// . |
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. |
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// Permission to use, copy, modify, sell, and distribute this software |
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// is hereby granted without fee, provided that the above copyright |
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// notice appears in all copies, and that both that copyright notice |
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// and this permission notice appear in supporting documentation. None |
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// of the above authors, nor IBM Haifa Research Laboratories, make any |
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// representation about the suitability of this software for any |
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// purpose. It is provided "as is" without express or implied |
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// warranty. |
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/** |
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* @file lu_counter_metadata.hpp |
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* Contains implementation of a lu counter policy's metadata. |
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*/ |
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namespace __gnu_pbds |
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{ |
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namespace detail |
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{ |
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template |
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class lu_counter_policy_base; |
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/// A list-update metadata type that moves elements to the front of |
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/// the list based on the counter algorithm. |
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template |
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class lu_counter_metadata |
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{ |
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public: |
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typedef Size_Type size_type; |
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private: |
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lu_counter_metadata(size_type init_count) : m_count(init_count) |
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{ } |
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friend class lu_counter_policy_base; |
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mutable size_type m_count; |
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}; |
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/// Base class for list-update counter policy. |
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template |
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class lu_counter_policy_base |
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{ |
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protected: |
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typedef Size_Type size_type; |
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lu_counter_metadata |
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operator()(size_type max_size) const |
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{ return lu_counter_metadata(std::rand() % max_size); } |
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template |
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bool |
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operator()(Metadata_Reference r_data, size_type m_max_count) const |
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{ |
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if (++r_data.m_count != m_max_count) |
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return false; |
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r_data.m_count = 0; |
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return true; |
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} |
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}; |
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} // namespace detail |
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} // namespace __gnu_pbds |