cpp-d1064d

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

diff --git a/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/pb_ds/list_update_policy.hpp b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/pb_ds/list_update_policy.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 list_update_policy.hpp
+ * Contains policies for list update containers.
+ */
+
+#ifndef PB_DS_LU_POLICY_HPP
+#define PB_DS_LU_POLICY_HPP
+
+#include <bits/c++config.h>
+#include <cstdlib>
+#include <ext/pb_ds/detail/list_update_policy/lu_counter_metadata.hpp>
+#include <ext/pb_ds/tag_and_trait.hpp>
+
+namespace __gnu_pbds
+{
+  /**
+   *  A list-update policy that unconditionally moves elements to the
+   *  front of the list. A null type means that each link in a
+   *  list-based container does not actually need metadata.
+   */
+ template<typename _Alloc = std::allocator<char> >
+   class lu_move_to_front_policy
+   {
+   public:
+     typedef _Alloc                                    allocator_type;
+
+     /// Metadata on which this functor operates.
+     typedef null_type                                         metadata_type;
+
+   private:
+     typedef typename _Alloc::template rebind<metadata_type> __rebind_m;
+
+   public:
+     /// Reference to metadata on which this functor operates.
+     typedef typename __rebind_m::other::reference     metadata_reference;
+
+     /// Creates a metadata object.
+     metadata_type
+     operator()() const
+     { return s_metadata; }
+
+     /// Decides whether a metadata object should be moved to the front
+     /// of the list.
+     inline bool
+     operator()(metadata_reference r_metadata) const
+     { return true; }
+
+   private:
+     static null_type                                  s_metadata;
+   };
+
+  /**
+   *  A list-update policy that moves elements to the front of the
+   *  list based on the counter algorithm.
+   */
+  template<std::size_t Max_Count = 5, typename _Alloc = std::allocator<char> >
+    class lu_counter_policy
+    : private detail::lu_counter_policy_base<typename _Alloc::size_type>
+    {
+    public:
+      typedef _Alloc                                   allocator_type;
+      typedef typename allocator_type::size_type               size_type;
+
+      enum
+       {
+         /// When some element is accessed this number of times, it
+         /// will be moved to the front of the list.
+         max_count = Max_Count
+       };
+
+      /// Metadata on which this functor operates.
+      typedef detail::lu_counter_metadata<size_type>   metadata_type;
+
+    private:
+      typedef detail::lu_counter_policy_base<size_type>        base_type;
+      typedef typename _Alloc::template rebind<metadata_type> __rebind_m;
+
+    public:
+      /// Reference to metadata on which this functor operates.
+      typedef typename __rebind_m::other::reference    metadata_reference;
+
+      /// Creates a metadata object.
+      metadata_type
+      operator()() const
+      { return base_type::operator()(max_count); }
+
+      /// Decides whether a metadata object should be moved to the front
+      /// of the list.
+      bool
+      operator()(metadata_reference r_data) const
+      { return base_type::operator()(r_data, max_count); }
+    };
+} // namespace __gnu_pbds
+
+#endif