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1 | // -*- C++ -*- |
2 | ||
a945c346 | 3 | // Copyright (C) 2005-2024 Free Software Foundation, Inc. |
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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 | |
748086b7 | 8 | // Foundation; either version 3, or (at your option) any later |
4569a895 AT |
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 | // You should have received a copy of the GNU General Public License | |
748086b7 JJ |
17 | // along with this library; see the file COPYING3. If not see |
18 | // <http://www.gnu.org/licenses/>. | |
19 | ||
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20 | |
21 | // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. | |
22 | ||
23 | // Permission to use, copy, modify, sell, and distribute this software | |
24 | // is hereby granted without fee, provided that the above copyright | |
25 | // notice appears in all copies, and that both that copyright notice | |
26 | // and this permission notice appear in supporting documentation. None | |
27 | // of the above authors, nor IBM Haifa Research Laboratories, make any | |
28 | // representation about the suitability of this software for any | |
29 | // purpose. It is provided "as is" without express or implied | |
30 | // warranty. | |
31 | ||
32 | /** | |
33 | * @file trie_split_example.cpp | |
34 | * A basic example showing how to split trie-based container objects. | |
35 | */ | |
36 | ||
37 | /** | |
38 | * This example shows how to split trie based containers, i.e., the opposite | |
39 | * of a join operation. | |
40 | */ | |
41 | ||
42 | #include <string> | |
43 | #include <cassert> | |
44 | #include <ext/pb_ds/assoc_container.hpp> | |
45 | ||
46 | using namespace std; | |
5e11f978 | 47 | using namespace __gnu_pbds; |
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48 | |
49 | int main() | |
50 | { | |
51 | // A PATRICIA trie table mapping strings to chars. | |
52 | typedef trie<string, char> map_type; | |
53 | ||
54 | // A map_type object. | |
55 | map_type r; | |
56 | ||
57 | // Inserts some entries into r. | |
58 | for (int i = 0; i < 100; ++ i) | |
59 | r.insert(make_pair(string(i, 'a'), 'b')); | |
60 | ||
61 | // Now split r into a different map_type object. | |
62 | ||
63 | // larger_r will hold the larger values following the split. | |
64 | map_type larger_r; | |
65 | ||
66 | // Split all elements with key larger than 'a'^1000 into larger_r. | |
67 | // This is exception free. | |
68 | r.split(string(1000, 'a'), larger_r); | |
69 | ||
70 | // Since there were no elements with key larger than 'a'^1000, r | |
71 | // should be unchanged. | |
72 | assert(r.size() == 100); | |
73 | assert(r.begin()->first == string("")); | |
74 | ||
75 | // Now perform a split which actually changes the content of r. | |
76 | ||
77 | // Split all elements with key larger than "aaa" into larger_r. | |
78 | r.split(string("aaa"), larger_r); | |
79 | ||
80 | assert(r.size() == 4); | |
81 | assert(larger_r.begin()->first == string("aaaa")); | |
82 | ||
83 | return 0; | |
84 | } | |
85 |