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4569a895 AT |
1 | // -*- C++ -*- |
2 | ||
748086b7 | 3 | // Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc. |
4569a895 AT |
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 | |
748086b7 | 8 | // Foundation; either version 3, or (at your option) any later |
4569a895 AT |
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 | ||
748086b7 JJ |
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. | |
4569a895 | 19 | |
748086b7 JJ |
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/>. | |
4569a895 AT |
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 list_update_policy.hpp | |
38 | * Contains policies for list update containers. | |
39 | */ | |
40 | ||
41 | #ifndef PB_DS_LU_POLICY_HPP | |
42 | #define PB_DS_LU_POLICY_HPP | |
43 | ||
4ba851b5 | 44 | #include <cstdlib> |
4569a895 AT |
45 | #include <ext/pb_ds/detail/list_update_policy/counter_lu_metadata.hpp> |
46 | ||
5e11f978 | 47 | namespace __gnu_pbds |
4569a895 AT |
48 | { |
49 | // A null type that means that each link in a list-based container | |
50 | // does not actually need metadata. | |
51 | struct null_lu_metadata | |
52 | { }; | |
53 | ||
54 | #define PB_DS_CLASS_T_DEC template<typename Allocator> | |
55 | #define PB_DS_CLASS_C_DEC move_to_front_lu_policy<Allocator> | |
56 | ||
57 | // A list-update policy that unconditionally moves elements to the | |
58 | // front of the list. | |
59 | template<typename Allocator = std::allocator<char> > | |
60 | class move_to_front_lu_policy | |
61 | { | |
62 | public: | |
b67758fe | 63 | typedef Allocator allocator_type; |
4569a895 AT |
64 | |
65 | // Metadata on which this functor operates. | |
66 | typedef null_lu_metadata metadata_type; | |
67 | ||
68 | // Reference to metadata on which this functor operates. | |
b67758fe | 69 | typedef typename allocator_type::template rebind<metadata_type>::other metadata_rebind; |
4569a895 AT |
70 | typedef typename metadata_rebind::reference metadata_reference; |
71 | ||
72 | // Creates a metadata object. | |
73 | metadata_type | |
74 | operator()() const; | |
75 | ||
beb5d0f4 BK |
76 | // Decides whether a metadata object should be moved to the front |
77 | // of the list. | |
4569a895 AT |
78 | inline bool |
79 | operator()(metadata_reference r_metadata) const; | |
80 | ||
81 | private: | |
82 | static null_lu_metadata s_metadata; | |
83 | }; | |
84 | ||
85 | #include <ext/pb_ds/detail/list_update_policy/mtf_lu_policy_imp.hpp> | |
86 | ||
87 | #undef PB_DS_CLASS_T_DEC | |
88 | #undef PB_DS_CLASS_C_DEC | |
89 | ||
90 | #define PB_DS_CLASS_T_DEC template<size_t Max_Count, class Allocator> | |
91 | #define PB_DS_CLASS_C_DEC counter_lu_policy<Max_Count, Allocator> | |
92 | ||
beb5d0f4 BK |
93 | // A list-update policy that moves elements to the front of the list |
94 | // based on the counter algorithm. | |
4569a895 AT |
95 | template<size_t Max_Count = 5, typename Allocator = std::allocator<char> > |
96 | class counter_lu_policy | |
97 | : private detail::counter_lu_policy_base<typename Allocator::size_type> | |
98 | { | |
99 | public: | |
b67758fe | 100 | typedef Allocator allocator_type; |
4569a895 AT |
101 | |
102 | enum | |
103 | { | |
104 | max_count = Max_Count | |
105 | }; | |
106 | ||
b67758fe | 107 | typedef typename allocator_type::size_type size_type; |
4569a895 AT |
108 | |
109 | // Metadata on which this functor operates. | |
110 | typedef detail::counter_lu_metadata<size_type> metadata_type; | |
111 | ||
112 | // Reference to metadata on which this functor operates. | |
113 | typedef typename Allocator::template rebind<metadata_type>::other metadata_rebind; | |
114 | typedef typename metadata_rebind::reference metadata_reference; | |
115 | ||
116 | // Creates a metadata object. | |
117 | metadata_type | |
118 | operator()() const; | |
119 | ||
beb5d0f4 BK |
120 | // Decides whether a metadata object should be moved to the front |
121 | // of the list. | |
4569a895 AT |
122 | bool |
123 | operator()(metadata_reference r_metadata) const; | |
124 | ||
125 | private: | |
126 | typedef detail::counter_lu_policy_base<typename Allocator::size_type> base_type; | |
127 | }; | |
128 | ||
129 | #include <ext/pb_ds/detail/list_update_policy/counter_lu_policy_imp.hpp> | |
130 | ||
131 | #undef PB_DS_CLASS_T_DEC | |
132 | #undef PB_DS_CLASS_C_DEC | |
133 | ||
5e11f978 | 134 | } // namespace __gnu_pbds |
4569a895 AT |
135 | |
136 | #endif |