// -*- C++ -*-
-// Copyright (C) 2005, 2006, 2007, 2009, 2010
+// 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
#include <bits/c++config.h>
#include <cstdlib>
-#include <ext/pb_ds/detail/list_update_policy/counter_lu_metadata.hpp>
+#include <ext/pb_ds/detail/list_update_policy/lu_counter_metadata.hpp>
+#include <ext/pb_ds/tag_and_trait.hpp>
namespace __gnu_pbds
{
- // A null type that means that each link in a list-based container
- // does not actually need metadata.
- struct null_lu_metadata
- { };
-
-#define PB_DS_CLASS_T_DEC template<typename Allocator>
-#define PB_DS_CLASS_C_DEC move_to_front_lu_policy<Allocator>
-
- // A list-update policy that unconditionally moves elements to the
- // front of the list.
- template<typename Allocator = std::allocator<char> >
- class move_to_front_lu_policy
- {
- public:
- typedef Allocator allocator_type;
-
- // Metadata on which this functor operates.
- typedef null_lu_metadata metadata_type;
-
- // Reference to metadata on which this functor operates.
- typedef typename allocator_type::template rebind<metadata_type>::other metadata_rebind;
- typedef typename metadata_rebind::reference metadata_reference;
-
- // Creates a metadata object.
- metadata_type
- operator()() const;
-
- // Decides whether a metadata object should be moved to the front
- // of the list.
- inline bool
- operator()(metadata_reference r_metadata) const;
-
- private:
- static null_lu_metadata s_metadata;
- };
-
-#include <ext/pb_ds/detail/list_update_policy/mtf_lu_policy_imp.hpp>
-
-#undef PB_DS_CLASS_T_DEC
-#undef PB_DS_CLASS_C_DEC
-
-#define PB_DS_CLASS_T_DEC template<std::size_t Max_Count, class Allocator>
-#define PB_DS_CLASS_C_DEC counter_lu_policy<Max_Count, Allocator>
-
- // 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 Allocator = std::allocator<char> >
- class counter_lu_policy
- : private detail::counter_lu_policy_base<typename Allocator::size_type>
- {
- public:
- typedef Allocator allocator_type;
-
- enum
- {
- max_count = Max_Count
- };
-
- typedef typename allocator_type::size_type size_type;
-
- // Metadata on which this functor operates.
- typedef detail::counter_lu_metadata<size_type> metadata_type;
-
- // Reference to metadata on which this functor operates.
- typedef typename Allocator::template rebind<metadata_type>::other metadata_rebind;
- typedef typename metadata_rebind::reference metadata_reference;
-
- // Creates a metadata object.
- metadata_type
- operator()() const;
-
- // Decides whether a metadata object should be moved to the front
- // of the list.
- bool
- operator()(metadata_reference r_metadata) const;
-
- private:
- typedef detail::counter_lu_policy_base<typename Allocator::size_type> base_type;
- };
-
-#include <ext/pb_ds/detail/list_update_policy/counter_lu_policy_imp.hpp>
-
-#undef PB_DS_CLASS_T_DEC
-#undef PB_DS_CLASS_C_DEC
-
+ /**
+ * 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
+ {
+ 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
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