1// -*- C++ -*-
2
3// Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
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
8// Foundation; either version 3, or (at your option) any later
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
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.
19
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/>.
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 standard_policies.hpp
38 * Contains standard policies for containers.
39 */
40
41#ifndef PB_DS_STANDARD_POLICIES_HPP
42#define PB_DS_STANDARD_POLICIES_HPP
43
44#include <memory>
45#include <ext/pb_ds/hash_policy.hpp>
46#include <ext/pb_ds/list_update_policy.hpp>
47#include <ext/pb_ds/tree_policy.hpp>
48#include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp>
49#include <ext/pb_ds/trie_policy.hpp>
50#include <ext/pb_ds/tag_and_trait.hpp>
51#include <tr1/functional>
52
53namespace __gnu_pbds
54{
55  namespace detail
56  {
57    template<typename Key>
58    struct default_hash_fn
59    {
60      typedef std::tr1::hash<Key> type;
61    };
62
63    template<typename Key>
64    struct default_eq_fn
65    {
66      typedef std::equal_to<Key> type;
67    };
68
69    enum
70      {
71	default_store_hash = false
72      };
73
74    struct default_comb_hash_fn
75    {
76      typedef __gnu_pbds::direct_mask_range_hashing<> type;
77    };
78
79    template<typename Comb_Hash_Fn>
80    struct default_resize_policy
81    {
82    private:
83      typedef typename Comb_Hash_Fn::size_type size_type;
84
85      typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn;
86      typedef is_same<default_fn, Comb_Hash_Fn> same_type;
87      typedef __gnu_pbds::hash_exponential_size_policy<size_type> iftrue;
88      typedef __gnu_pbds::hash_prime_size_policy iffalse;
89      typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type;
90      typedef typename cond_type::__type size_policy_type;
91
92      typedef __gnu_pbds::hash_load_check_resize_trigger<false, size_type> trigger;
93
94    public:
95      typedef __gnu_pbds::hash_standard_resize_policy<size_policy_type, trigger, false, size_type> type;
96    };
97
98    struct default_update_policy
99    {
100      typedef __gnu_pbds::move_to_front_lu_policy<> type;
101    };
102
103    template<typename Comb_Probe_Fn>
104    struct default_probe_fn
105    {
106    private:
107      typedef typename Comb_Probe_Fn::size_type size_type;
108
109      typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn;
110      typedef is_same<default_fn, Comb_Probe_Fn> same_type;
111      typedef __gnu_pbds::linear_probe_fn<size_type> iftrue;
112      typedef __gnu_pbds::quadratic_probe_fn<size_type> iffalse;
113      typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type;
114
115    public:
116      typedef typename cond_type::__type type;
117    };
118
119    template<typename Key>
120    struct default_trie_e_access_traits;
121
122    template<typename Char, class Char_Traits>
123    struct default_trie_e_access_traits<std::basic_string<Char, Char_Traits, std::allocator<char> > >
124    {
125    private:
126      typedef std::basic_string<Char, Char_Traits, std::allocator<char> > string_type;
127
128    public:
129      typedef __gnu_pbds::string_trie_e_access_traits<string_type> type;
130    };
131
132  } // namespace detail
133} // namespace __gnu_pbds
134
135#endif // #ifndef PB_DS_STANDARD_POLICIES_HPP
136
137