standard_policies.hpp

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00001 // -*- C++ -*-
00002 
00003 // Copyright (C) 2005, 2006, 2007 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 <tr1/functional>
00058 
00059 namespace __gnu_pbds
00060 {
00061   namespace detail
00062   {
00063     template<typename Key>
00064     struct default_hash_fn
00065     {
00066       typedef std::tr1::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 __gnu_pbds::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 __gnu_pbds::direct_mask_range_hashing<size_type> default_fn;
00092       typedef is_same<default_fn, Comb_Hash_Fn> same_type;
00093       typedef __gnu_pbds::hash_exponential_size_policy<size_type> iftrue;
00094       typedef __gnu_pbds::hash_prime_size_policy iffalse;
00095       typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type;
00096       typedef typename cond_type::__type size_policy_type;
00097 
00098       typedef __gnu_pbds::hash_load_check_resize_trigger<false, size_type> trigger;
00099 
00100     public:
00101       typedef __gnu_pbds::hash_standard_resize_policy<size_policy_type, trigger, false, size_type> type;
00102     };
00103 
00104     struct default_update_policy
00105     {
00106       typedef __gnu_pbds::move_to_front_lu_policy<> type;
00107     };
00108 
00109     template<typename Comb_Probe_Fn>
00110     struct default_probe_fn
00111     {
00112     private:
00113       typedef typename Comb_Probe_Fn::size_type size_type;
00114 
00115       typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn;
00116       typedef is_same<default_fn, Comb_Probe_Fn> same_type;
00117       typedef __gnu_pbds::linear_probe_fn<size_type> iftrue;
00118       typedef __gnu_pbds::quadratic_probe_fn<size_type> iffalse;
00119       typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type;
00120 
00121     public:
00122       typedef typename cond_type::__type type;
00123     };
00124 
00125     template<typename Key>
00126     struct default_trie_e_access_traits;
00127 
00128     template<typename Char, class Char_Traits>
00129     struct default_trie_e_access_traits<std::basic_string<Char, Char_Traits, std::allocator<char> > >
00130     {
00131     private:
00132       typedef std::basic_string<Char, Char_Traits, std::allocator<char> > string_type;
00133 
00134     public:
00135       typedef __gnu_pbds::string_trie_e_access_traits<string_type> type;
00136     };
00137 
00138   } // namespace detail
00139 } // namespace __gnu_pbds
00140 
00141 #endif // #ifndef PB_DS_STANDARD_POLICIES_HPP
00142 

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