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3 // Copyright (C) 2005-2021 Free Software Foundation, Inc.
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
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.
16 // You should have received a copy of the GNU General Public License
17 // along with this library; see the file COPYING3. If not see
18 // <http://www.gnu.org/licenses/>.
21 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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
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33 * @file priority_queue_erase_if.cpp
34 * Example showing how to conditionally erase values from a priority queue.
38 * This example shows how to erase from a priority queue using erase_if.
44 #include <ext/pb_ds/priority_queue.hpp>
47 using namespace __gnu_pbds
;
52 __gnu_pbds::priority_queue
<int> p
;
54 // First we insert some values into the container.
55 for (int i
= 0; i
< 1000; ++i
)
58 assert(p
.top() == 999);
60 // Now we erase all values that satisfy some predicate, in this case
61 // one that returns true for all those larger than 500.
62 p
.erase_if(bind1st(less
<int>(), 500));
64 // The largest value should be now 500.
65 assert(p
.top() == 500);