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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libstdc++-v3/testsuite/ext/pb_ds/example/tree_order_statistics.cc | |
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Diffstat (limited to 'libstdc++-v3/testsuite/ext/pb_ds/example/tree_order_statistics.cc')
-rw-r--r-- | libstdc++-v3/testsuite/ext/pb_ds/example/tree_order_statistics.cc | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/ext/pb_ds/example/tree_order_statistics.cc b/libstdc++-v3/testsuite/ext/pb_ds/example/tree_order_statistics.cc new file mode 100644 index 000000000..584574030 --- /dev/null +++ b/libstdc++-v3/testsuite/ext/pb_ds/example/tree_order_statistics.cc @@ -0,0 +1,124 @@ +// -*- C++ -*- + +// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the terms +// of the GNU General Public License as published by the Free Software +// Foundation; either version 3, or (at your option) any later +// version. + +// This library is distributed in the hope that it will be useful, but +// WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// General Public License for more details. + +// You should have received a copy of the GNU General Public License +// along with this library; see the file COPYING3. If not see +// <http://www.gnu.org/licenses/>. + + +// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. + +// Permission to use, copy, modify, sell, and distribute this software +// is hereby granted without fee, provided that the above copyright +// notice appears in all copies, and that both that copyright notice +// and this permission notice appear in supporting documentation. None +// of the above authors, nor IBM Haifa Research Laboratories, make any +// representation about the suitability of this software for any +// purpose. It is provided "as is" without express or implied +// warranty. + +/** + * @file tree_order_statistics_example.cpp + * An example showing how to use functors for order-statistics + * in tree-based containers. + */ + +/** + * In some cases tree structure can be used for various purposes asides + * from storing entries by key order. + * This example shows how a tree-based container can be used for + * order-statistics, i.e., for determining the order of each key + * in the (ordered) sequence of keys stored within the container object. + */ + +#include <cassert> +#include <ext/pb_ds/assoc_container.hpp> +#include <ext/pb_ds/tree_policy.hpp> + +using namespace std; +using namespace __gnu_pbds; + +// A red-black tree table storing ints and their order +// statistics. Note that since the tree uses +// tree_order_statistics_node_update as its update policy, then it +// includes its methods by_order and order_of_key. +typedef +tree< + int, + null_mapped_type, + less<int>, + rb_tree_tag, + // This policy updates nodes' metadata for order statistics. + tree_order_statistics_node_update> +set_t; + +int main() +{ + // Insert some entries into s. + set_t s; + s.insert(12); + s.insert(505); + s.insert(30); + s.insert(1000); + s.insert(10000); + s.insert(100); + + // The order of the keys should be: 12, 30, 100, 505, 1000, 10000. + assert(*s.find_by_order(0) == 12); + assert(*s.find_by_order(1) == 30); + assert(*s.find_by_order(2) == 100); + assert(*s.find_by_order(3) == 505); + assert(*s.find_by_order(4) == 1000); + assert(*s.find_by_order(5) == 10000); + assert(s.find_by_order(6) == s.end()); + + // The order of the keys should be: 12, 30, 100, 505, 1000, 10000. + assert(s.order_of_key(10) == 0); + assert(s.order_of_key(12) == 0); + assert(s.order_of_key(15) == 1); + assert(s.order_of_key(30) == 1); + assert(s.order_of_key(99) == 2); + assert(s.order_of_key(100) == 2); + assert(s.order_of_key(505) == 3); + assert(s.order_of_key(1000) == 4); + assert(s.order_of_key(10000) == 5); + assert(s.order_of_key(9999999) == 6); + + // Erase an entry. + s.erase(30); + + // The order of the keys should be: 12, 100, 505, 1000, 10000. + assert(*s.find_by_order(0) == 12); + assert(*s.find_by_order(1) == 100); + assert(*s.find_by_order(2) == 505); + assert(*s.find_by_order(3) == 1000); + assert(*s.find_by_order(4) == 10000); + assert(s.find_by_order(5) == s.end()); + + // The order of the keys should be: 12, 100, 505, 1000, 10000. + assert(s.order_of_key(10) == 0); + assert(s.order_of_key(12) == 0); + assert(s.order_of_key(100) == 1); + assert(s.order_of_key(505) == 2); + assert(s.order_of_key(707) == 3); + assert(s.order_of_key(1000) == 3); + assert(s.order_of_key(1001) == 4); + assert(s.order_of_key(10000) == 4); + assert(s.order_of_key(100000) == 5); + assert(s.order_of_key(9999999) == 5); + + return 0; +} + |