# 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