1 // -*- C++ -*- 2 3 // Copyright (C) 2005-2018 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 26 27 // Permission to use, copy, modify, sell, and distribute this software 28 // is hereby granted without fee, provided that the above copyright 29 // notice appears in all copies, and that both that copyright notice 30 // and this permission notice appear in supporting documentation. None 31 // of the above authors, nor IBM Haifa Research Laboratories, make any 32 // representation about the suitability of this software for any 33 // purpose. It is provided "as is" without express or implied 34 // warranty. 35 36 /** 37 * @file branch_policy/branch_policy.hpp 38 * Contains a base class for branch policies. 39 */ 40 41 #ifndef PB_DS_BRANCH_POLICY_BASE_HPP 42 #define PB_DS_BRANCH_POLICY_BASE_HPP 43 44 #include <ext/pb_ds/tag_and_trait.hpp> 45 46 namespace __gnu_pbds 47 { 48 namespace detail 49 { 50 /// Primary template, base class for branch structure policies. 51 template<typename Node_CItr, typename Node_Itr, typename _Alloc> 52 struct branch_policy 53 { 54 protected: 55 typedef typename Node_Itr::value_type it_type; 56 typedef typename std::iterator_traits<it_type>::value_type value_type; 57 typedef typename value_type::first_type key_type; 58 59 typedef typename remove_const<value_type>::type rcvalue_type; 60 typedef typename remove_const<key_type>::type rckey_type; 61 62 typedef typename _Alloc::template rebind<rcvalue_type>::other rebind_v; 63 typedef typename _Alloc::template rebind<rckey_type>::other rebind_k; 64 65 typedef typename rebind_v::reference reference; 66 typedef typename rebind_v::const_reference const_reference; 67 typedef typename rebind_v::const_pointer const_pointer; 68 69 typedef typename rebind_k::const_reference key_const_reference; 70 71 static inline key_const_reference 72 extract_key(const_reference r_val) 73 { return r_val.first; } 74 75 virtual it_type 76 end() = 0; 77 78 it_type 79 end_iterator() const 80 { return const_cast<branch_policy*>(this)->end(); } 81 82 virtual 83 ~branch_policy() { } 84 }; 85 86 /// Specialization for const iterators. 87 template<typename Node_CItr, typename _Alloc> 88 struct branch_policy<Node_CItr, Node_CItr, _Alloc> 89 { 90 protected: 91 typedef typename Node_CItr::value_type it_type; 92 typedef typename std::iterator_traits<it_type>::value_type value_type; 93 typedef typename remove_const<value_type>::type rcvalue_type; 94 typedef typename _Alloc::template rebind<rcvalue_type>::other rebind_v; 95 typedef typename rebind_v::reference reference; 96 typedef typename rebind_v::const_reference const_reference; 97 typedef typename rebind_v::const_pointer const_pointer; 98 99 typedef value_type key_type; 100 typedef typename rebind_v::const_reference key_const_reference; 101 102 static inline key_const_reference 103 extract_key(const_reference r_val) 104 { return r_val; } 105 106 virtual it_type 107 end() const = 0; 108 109 it_type 110 end_iterator() const 111 { return end(); } 112 113 virtual 114 ~branch_policy() { } 115 }; 116 } // namespace detail 117 } // namespace __gnu_pbds 118 119 #endif // #ifndef PB_DS_BRANCH_POLICY_BASE_HPP 120