cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / c++ / 4.7 / ext / pb_ds / detail / list_update_policy / lu_counter_metadata.hpp

diff --git a/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/pb_ds/detail/list_update_policy/lu_counter_metadata.hpp b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/pb_ds/detail/list_update_policy/lu_counter_metadata.hpp
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+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2007, 2009, 2010, 2011
+// Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 3, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
+
+// Permission to use, copy, modify, sell, and distribute this software
+// is hereby granted without fee, provided that the above copyright
+// notice appears in all copies, and that both that copyright notice
+// and this permission notice appear in supporting documentation. None
+// of the above authors, nor IBM Haifa Research Laboratories, make any
+// representation about the suitability of this software for any
+// purpose. It is provided "as is" without express or implied
+// warranty.
+
+/**
+ * @file lu_counter_metadata.hpp
+ * Contains implementation of a lu counter policy's metadata.
+ */
+
+namespace __gnu_pbds
+{
+  namespace detail
+  {
+    template<typename Size_Type>
+      class lu_counter_policy_base;
+
+    /// A list-update metadata type that moves elements to the front of
+    /// the list based on the counter algorithm.
+    template<typename Size_Type = std::size_t>
+      class lu_counter_metadata
+      {
+      public:
+       typedef Size_Type       size_type;
+
+      private:
+       lu_counter_metadata(size_type init_count) : m_count(init_count)
+       { }
+
+       friend class lu_counter_policy_base<size_type>;
+
+       mutable size_type       m_count;
+    };
+
+    /// Base class for list-update counter policy.
+    template<typename Size_Type>
+      class lu_counter_policy_base
+      {
+      protected:
+       typedef Size_Type       size_type;
+
+       lu_counter_metadata<size_type>
+       operator()(size_type max_size) const
+       { return lu_counter_metadata<Size_Type>(std::rand() % max_size); }
+
+       template<typename Metadata_Reference>
+       bool
+       operator()(Metadata_Reference r_data, size_type m_max_count) const
+       {
+         if (++r_data.m_count != m_max_count)
+           return false;
+         r_data.m_count = 0;
+         return true;
+       }
+      };
+  } // namespace detail
+} // namespace __gnu_pbds