libstdc++
standard_policies.hpp
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00001 // -*- C++ -*-
00002 
00003 // Copyright (C) 2005, 2006, 2007, 2009 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
00026 
00027 // Permission to use, copy, modify, sell, and distribute this software
00028 // is hereby granted without fee, provided that the above copyright
00029 // notice appears in all copies, and that both that copyright notice
00030 // and this permission notice appear in supporting documentation. None
00031 // of the above authors, nor IBM Haifa Research Laboratories, make any
00032 // representation about the suitability of this software for any
00033 // purpose. It is provided "as is" without express or implied
00034 // warranty.
00035 
00036 /**
00037  * @file standard_policies.hpp
00038  * Contains standard policies for containers.
00039  */
00040 
00041 #ifndef PB_DS_STANDARD_POLICIES_HPP
00042 #define PB_DS_STANDARD_POLICIES_HPP
00043 
00044 #include <memory>
00045 #include <ext/pb_ds/hash_policy.hpp>
00046 #include <ext/pb_ds/list_update_policy.hpp>
00047 #include <ext/pb_ds/tree_policy.hpp>
00048 #include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp>
00049 #include <ext/pb_ds/trie_policy.hpp>
00050 #include <ext/pb_ds/tag_and_trait.hpp>
00051 #include <tr1/functional>
00052 
00053 namespace __gnu_pbds
00054 {
00055   namespace detail
00056   {
00057     template<typename Key>
00058     struct default_hash_fn
00059     {
00060       typedef std::tr1::hash<Key> type;
00061     };
00062 
00063     template<typename Key>
00064     struct default_eq_fn
00065     {
00066       typedef std::equal_to<Key> type;
00067     };
00068 
00069     enum
00070       {
00071     default_store_hash = false
00072       };
00073 
00074     struct default_comb_hash_fn
00075     {
00076       typedef __gnu_pbds::direct_mask_range_hashing<> type;
00077     };
00078 
00079     template<typename Comb_Hash_Fn>
00080     struct default_resize_policy
00081     {
00082     private:
00083       typedef typename Comb_Hash_Fn::size_type size_type;
00084 
00085       typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn;
00086       typedef is_same<default_fn, Comb_Hash_Fn> same_type;
00087       typedef __gnu_pbds::hash_exponential_size_policy<size_type> iftrue;
00088       typedef __gnu_pbds::hash_prime_size_policy iffalse;
00089       typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type;
00090       typedef typename cond_type::__type size_policy_type;
00091 
00092       typedef __gnu_pbds::hash_load_check_resize_trigger<false, size_type> trigger;
00093 
00094     public:
00095       typedef __gnu_pbds::hash_standard_resize_policy<size_policy_type, trigger, false, size_type> type;
00096     };
00097 
00098     struct default_update_policy
00099     {
00100       typedef __gnu_pbds::move_to_front_lu_policy<> type;
00101     };
00102 
00103     template<typename Comb_Probe_Fn>
00104     struct default_probe_fn
00105     {
00106     private:
00107       typedef typename Comb_Probe_Fn::size_type size_type;
00108 
00109       typedef __gnu_pbds::direct_mask_range_hashing<size_type> default_fn;
00110       typedef is_same<default_fn, Comb_Probe_Fn> same_type;
00111       typedef __gnu_pbds::linear_probe_fn<size_type> iftrue;
00112       typedef __gnu_pbds::quadratic_probe_fn<size_type> iffalse;
00113       typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type;
00114 
00115     public:
00116       typedef typename cond_type::__type type;
00117     };
00118 
00119     template<typename Key>
00120     struct default_trie_e_access_traits;
00121 
00122     template<typename Char, class Char_Traits>
00123     struct default_trie_e_access_traits<std::basic_string<Char, Char_Traits, std::allocator<char> > >
00124     {
00125     private:
00126       typedef std::basic_string<Char, Char_Traits, std::allocator<char> > string_type;
00127 
00128     public:
00129       typedef __gnu_pbds::string_trie_e_access_traits<string_type> type;
00130     };
00131 
00132   } // namespace detail
00133 } // namespace __gnu_pbds
00134 
00135 #endif // #ifndef PB_DS_STANDARD_POLICIES_HPP
00136