1 // -*- C++ -*-
2 
3 // Copyright (C) 2005, 2006, 2009 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
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34 // warranty.
35 
36 /**
37  * @file pat_trie_/synth_access_traits.hpp
38  * Contains an implementation class for a patricia tree.
39  */
40 
41 #ifndef PB_DS_SYNTH_E_ACCESS_TRAITS_HPP
42 #define PB_DS_SYNTH_E_ACCESS_TRAITS_HPP
43 
44 #include <ext/pb_ds/detail/type_utils.hpp>
45 
46 namespace __gnu_pbds
47 {
48   namespace detail
49   {
50 
51 #define PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC \
52     template<typename Type_Traits, bool Set, typename _ATraits>
53 
54 #define PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC \
55     synth_access_traits<Type_Traits, Set, _ATraits>
56 
57     /// Synthetic element access traits.
58     template<typename Type_Traits, bool Set, typename _ATraits>
59     struct synth_access_traits : public _ATraits
60     {
61       typedef _ATraits 					base_type;
62       typedef typename base_type::const_iterator	const_iterator;
63       typedef Type_Traits 				type_traits;
64       typedef typename type_traits::const_reference 	const_reference;
65       typedef typename type_traits::key_const_reference key_const_reference;
66 
67       synth_access_traits();
68 
69       synth_access_traits(const base_type&);
70 
71       inline bool
72       equal_prefixes(const_iterator, const_iterator, const_iterator,
73 		     const_iterator, bool compare_after = true) const;
74 
75       bool
76       equal_keys(key_const_reference, key_const_reference) const;
77 
78       bool
79       cmp_prefixes(const_iterator, const_iterator, const_iterator,
80 		   const_iterator, bool compare_after = false) const;
81 
82       bool
83       cmp_keys(key_const_reference, key_const_reference) const;
84 
85       inline static key_const_reference
86       extract_key(const_reference);
87 
88 #ifdef _GLIBCXX_DEBUG
89       bool
90       operator()(key_const_reference, key_const_reference);
91 #endif
92 
93     private:
94       inline static key_const_reference
95       extract_key(const_reference, true_type);
96 
97       inline static key_const_reference
98       extract_key(const_reference, false_type);
99 
100       static integral_constant<int, Set> s_set_ind;
101     };
102 
103     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
104     integral_constant<int,Set>
105     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::s_set_ind;
106 
107     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
108     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
109     synth_access_traits()
110     { }
111 
112     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
113     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
114     synth_access_traits(const _ATraits& r_traits)
115     : _ATraits(r_traits)
116     { }
117 
118     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
119     inline bool
120     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
121     equal_prefixes(const_iterator b_l, const_iterator e_l, const_iterator b_r,
122 		   const_iterator e_r, bool compare_after /*= false */) const
123     {
124       while (b_l != e_l)
125 	{
126 	  if (b_r == e_r)
127 	    return false;
128 	  if (base_type::e_pos(*b_l) != base_type::e_pos(*b_r))
129 	    return false;
130 	  ++b_l;
131 	  ++b_r;
132 	}
133       return (!compare_after || b_r == e_r);
134     }
135 
136     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
137     bool
138     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
139     equal_keys(key_const_reference r_lhs_key,
140 	       key_const_reference r_rhs_key) const
141     {
142       return equal_prefixes(base_type::begin(r_lhs_key),
143 			    base_type::end(r_lhs_key),
144 			    base_type::begin(r_rhs_key),
145 			    base_type::end(r_rhs_key),
146 			    true);
147     }
148 
149     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
150     bool
151     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
152     cmp_prefixes(const_iterator b_l, const_iterator e_l, const_iterator b_r,
153 		 const_iterator e_r, bool compare_after /* = false*/) const
154     {
155       while (b_l != e_l)
156 	{
157 	  if (b_r == e_r)
158 	    return false;
159 
160 	  const typename base_type::size_type l_pos = base_type::e_pos(*b_l);
161 	  const typename base_type::size_type r_pos = base_type::e_pos(*b_r);
162 	  if (l_pos != r_pos)
163 	    return l_pos < r_pos;
164 	  ++b_l;
165 	  ++b_r;
166 	}
167 
168       if (!compare_after)
169 	return false;
170       return b_r != e_r;
171     }
172 
173     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
174     bool
175     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
176     cmp_keys(key_const_reference r_lhs_key,
177 	     key_const_reference r_rhs_key) const
178     {
179       return cmp_prefixes(base_type::begin(r_lhs_key),
180 			  base_type::end(r_lhs_key),
181 			  base_type::begin(r_rhs_key),
182 			  base_type::end(r_rhs_key),
183 			  true);
184     }
185 
186     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
187     inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
188     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
189     extract_key(const_reference r_val)
190     { return extract_key(r_val, s_set_ind); }
191 
192     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
193     inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
194     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
195     extract_key(const_reference r_val, true_type)
196     { return r_val; }
197 
198     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
199     inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
200     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
201     extract_key(const_reference r_val, false_type)
202     { return r_val.first; }
203 
204 #ifdef _GLIBCXX_DEBUG
205     PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
206     bool
207     PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
208     operator()(key_const_reference r_lhs, key_const_reference r_rhs)
209     { return cmp_keys(r_lhs, r_rhs); }
210 #endif
211 
212 #undef PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
213 #undef PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC
214 
215   } // namespace detail
216 } // namespace __gnu_pbds
217 
218 #endif
219