libstdc++-v3/include/ext/pb_ds/detail/standard_policies.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006, 2007 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 2, 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 // You should have received a copy of the GNU General Public License
  17 // along with this library; see the file COPYING.  If not, write to
  18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  19 // MA 02111-1307, USA.
  20
  21 // As a special exception, you may use this file as part of a free
  22 // software library without restriction.  Specifically, if other files
  23 // instantiate templates or use macros or inline functions from this
  24 // file, or you compile this file and link it with other files to
  25 // produce an executable, this file does not by itself cause the
  26 // resulting executable to be covered by the GNU General Public
  27 // License.  This exception does not however invalidate any other
  28 // reasons why the executable file might be covered by the GNU General
  29 // Public License.
  30
  31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  32
  33 // Permission to use, copy, modify, sell, and distribute this software
  34 // is hereby granted without fee, provided that the above copyright
  35 // notice appears in all copies, and that both that copyright notice
  36 // and this permission notice appear in supporting documentation. None
  37 // of the above authors, nor IBM Haifa Research Laboratories, make any
  38 // representation about the suitability of this software for any
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  40 // warranty.
  41
  42 /**
  43  * @file standard_policies.hpp
  44  * Contains standard policies for containers.
  45  */
  46
  47 #ifndef PB_DS_STANDARD_POLICIES_HPP
  48 #define PB_DS_STANDARD_POLICIES_HPP
  49
  50 #include <memory>
  51 #include <ext/pb_ds/hash_policy.hpp>
  52 #include <ext/pb_ds/list_update_policy.hpp>
  53 #include <ext/pb_ds/tree_policy.hpp>
  54 #include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp>
  55 #include <ext/pb_ds/trie_policy.hpp>
  56 #include <ext/pb_ds/tag_and_trait.hpp>
  57 #include <tr1/functional>
  58
  59 namespace __gnu_pbds
  60 {
  61   namespace detail
  62   {
  63     template<typename Key>
  64     struct default_hash_fn
  65     {
  66       typedef std::tr1::hash<Key> type;
  67     };
  68
  69     template<typename Key>
  70     struct default_eq_fn
  71     {
  72       typedef std::equal_to<Key> type;
  73     };
  74
  75     enum
  76       {
  77         default_store_hash = false
  78       };
  79
  80     struct default_comb_hash_fn
  81     {
  82       typedef __gnu_pbds::direct_mask_range_hashing<> type;
  83     };
  84
  85     template<typename Comb_Hash_Fn>
  86     struct default_resize_policy
  87     {
  88     private:
  89       typedef typename Comb_Hash_Fn::size_type size_type;
  90
  91       typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn;
  92       typedef is_same<default_fn, Comb_Hash_Fn> same_type;
  93       typedef __gnu_pbds::hash_exponential_size_policy<size_type> iftrue;
  94       typedef __gnu_pbds::hash_prime_size_policy iffalse;
  95       typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type;
  96       typedef typename cond_type::__type size_policy_type;
  97
  98       typedef __gnu_pbds::hash_load_check_resize_trigger<false, size_type> trigger;
  99
 100     public:
 101       typedef __gnu_pbds::hash_standard_resize_policy<size_policy_type, trigger, false, size_type> type;
 102     };
 103
 104     struct default_update_policy
 105     {
 106       typedef __gnu_pbds::move_to_front_lu_policy<> type;
 107     };
 108
 109     template<typename Comb_Probe_Fn>
 110     struct default_probe_fn
 111     {
 112     private:
 113       typedef typename Comb_Probe_Fn::size_type size_type;
 114
 115       typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn;
 116       typedef is_same<default_fn, Comb_Probe_Fn> same_type;
 117       typedef __gnu_pbds::linear_probe_fn<size_type> iftrue;
 118       typedef __gnu_pbds::quadratic_probe_fn<size_type> iffalse;
 119       typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type;
 120
 121     public:
 122       typedef typename cond_type::__type type;
 123     };
 124
 125     template<typename Key>
 126     struct default_trie_e_access_traits;
 127
 128     template<typename Char, class Char_Traits>
 129     struct default_trie_e_access_traits<std::basic_string<Char, Char_Traits, std::allocator<char> > >
 130     {
 131     private:
 132       typedef std::basic_string<Char, Char_Traits, std::allocator<char> > string_type;
 133
 134     public:
 135       typedef __gnu_pbds::string_trie_e_access_traits<string_type> type;
 136     };
 137
 138   } // namespace detail
 139 } // namespace __gnu_pbds
 140
 141 #endif // #ifndef PB_DS_STANDARD_POLICIES_HPP
 142