# standard_policies.hpp

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    00001 // -*- C++ -*-
    00002
    00003 // Copyright (C) 2005, 2006 Free Software Foundation, Inc.
    00004 //
    00005 // This file is part of the GNU ISO C++ Library.  This library is free
    00006 // software; you can redistribute it and/or modify it under the terms
    00007 // of the GNU General Public License as published by the Free Software
    00008 // Foundation; either version 2, or (at your option) any later
    00009 // version.
    00010
    00011 // This library is distributed in the hope that it will be useful, but
    00012 // WITHOUT ANY WARRANTY; without even the implied warranty of
    00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00014 // General Public License for more details.
    00015
    00016 // You should have received a copy of the GNU General Public License
    00017 // along with this library; see the file COPYING.  If not, write to
    00018 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
    00019 // MA 02111-1307, USA.
    00020
    00021 // As a special exception, you may use this file as part of a free
    00022 // software library without restriction.  Specifically, if other files
    00023 // instantiate templates or use macros or inline functions from this
    00024 // file, or you compile this file and link it with other files to
    00025 // produce an executable, this file does not by itself cause the
    00026 // resulting executable to be covered by the GNU General Public
    00027 // License.  This exception does not however invalidate any other
    00028 // reasons why the executable file might be covered by the GNU General
    00029 // Public License.
    00030
    00031 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
    00032
    00033 // Permission to use, copy, modify, sell, and distribute this software
    00034 // is hereby granted without fee, provided that the above copyright
    00035 // notice appears in all copies, and that both that copyright notice
    00036 // and this permission notice appear in supporting documentation. None
    00037 // of the above authors, nor IBM Haifa Research Laboratories, make any
    00038 // representation about the suitability of this software for any
    00039 // purpose. It is provided "as is" without express or implied
    00040 // warranty.
    00041
    00042 /**
    00043  * @file standard_policies.hpp
    00044  * Contains standard policies for containers.
    00045  */
    00046
    00047 #ifndef PB_DS_STANDARD_POLICIES_HPP
    00048 #define PB_DS_STANDARD_POLICIES_HPP
    00049
    00050 #include <memory>
    00051 #include <ext/pb_ds/hash_policy.hpp>
    00052 #include <ext/pb_ds/list_update_policy.hpp>
    00053 #include <ext/pb_ds/tree_policy.hpp>
    00054 #include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp>
    00055 #include <ext/pb_ds/trie_policy.hpp>
    00056 #include <ext/pb_ds/tag_and_trait.hpp>
    00057 #include <ext/hash_map>
    00058
    00059 namespace pb_ds
    00060 {
    00061   namespace detail
    00062   {
    00063     template<typename Key>
    00064     struct default_hash_fn
    00065     {
    00066       typedef __gnu_cxx::hash< Key> type;
    00067     };
    00068
    00069     template<typename Key>
    00070     struct default_eq_fn
    00071     {
    00072       typedef std::equal_to< Key> type;
    00073     };
    00074
    00075     enum
    00076       {
    00077     default_store_hash = false
    00078       };
    00079
    00080     struct default_comb_hash_fn
    00081     {
    00082       typedef pb_ds::direct_mask_range_hashing<> type;
    00083     };
    00084
    00085     template<typename Comb_Hash_Fn>
    00086     struct default_resize_policy
    00087     {
    00088     private:
    00089       typedef typename Comb_Hash_Fn::size_type size_type;
    00090
    00091       typedef
    00092       typename __conditional_type<
    00093     is_same<
    00094     pb_ds::direct_mask_range_hashing<
    00095     size_type>,
    00096     Comb_Hash_Fn>::value,
    00097     pb_ds::hash_exponential_size_policy<
    00098     size_type>,
    00099     pb_ds::hash_prime_size_policy>::__type
    00100       size_policy_type;
    00101
    00102     public:
    00103       typedef
    00104       pb_ds::hash_standard_resize_policy<
    00105       size_policy_type,
    00106       pb_ds::hash_load_check_resize_trigger<
    00107       false,
    00108       size_type>,
    00109       false,
    00110       size_type>
    00111       type;
    00112     };
    00113
    00114     struct default_update_policy
    00115     {
    00116       typedef pb_ds::move_to_front_lu_policy<> type;
    00117     };
    00118
    00119     template<typename Comb_Probe_Fn>
    00120     struct default_probe_fn
    00121     {
    00122     private:
    00123       typedef typename Comb_Probe_Fn::size_type size_type;
    00124
    00125     public:
    00126       typedef
    00127       typename __conditional_type<
    00128       is_same<
    00129       pb_ds::direct_mask_range_hashing<size_t>,
    00130       Comb_Probe_Fn>::value,
    00131       pb_ds::linear_probe_fn<
    00132       size_type>,
    00133       pb_ds::quadratic_probe_fn<
    00134       size_type> >::__type
    00135       type;
    00136     };
    00137
    00138     template<typename Key>
    00139     struct default_trie_e_access_traits;
    00140
    00141     template<typename Char, class Char_Traits>
    00142     struct default_trie_e_access_traits<
    00143       std::basic_string<
    00144       Char,
    00145       Char_Traits,
    00146       std::allocator<
    00147       char> > >
    00148     {
    00149       typedef
    00150       pb_ds::string_trie_e_access_traits<
    00151     std::basic_string<
    00152     Char,
    00153     Char_Traits,
    00154     std::allocator<
    00155     char> > >
    00156       type;
    00157     };
    00158
    00159   } // namespace detail
    00160 } // namespace pb_ds
    00161
    00162 #endif // #ifndef PB_DS_STANDARD_POLICIES_HPP
    00163