libstdc++
standard_policies.hpp
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1 // -*- C++ -*-
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3 // Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
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25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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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>
48 #include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp>
51 #include <tr1/functional>
52 
53 namespace __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:
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 
One of the comparison functors.
Definition: stl_function.h:205
Managing sequences of characters and character-like objects.
Definition: basic_string.h:107