1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14
10
11// <unordered_set>
12
13// class unordered_set
14
15// node_type extract(key_type const&);
16
17#include <unordered_set>
18#include "test_macros.h"
19#include "min_allocator.h"
20#include "Counter.h"
21
22template <class Container, class KeyTypeIter>
23void test(Container& c, KeyTypeIter first, KeyTypeIter last)
24{
25 std::size_t sz = c.size();
26 assert((std::size_t)std::distance(first, last) == sz);
27
28 for (KeyTypeIter copy = first; copy != last; ++copy)
29 {
30 typename Container::node_type t = c.extract(*copy);
31 assert(!t.empty());
32 --sz;
33 assert(t.value() == *copy);
34 assert(t.get_allocator() == c.get_allocator());
35 assert(sz == c.size());
36 }
37
38 assert(c.size() == 0);
39
40 for (KeyTypeIter copy = first; copy != last; ++copy)
41 {
42 typename Container::node_type t = c.extract(*copy);
43 assert(t.empty());
44 }
45}
46
47int main(int, char**)
48{
49 {
50 std::unordered_set<int> m = {1, 2, 3, 4, 5, 6};
51 int keys[] = {1, 2, 3, 4, 5, 6};
52 test(c&: m, first: std::begin(arr&: keys), last: std::end(arr&: keys));
53 }
54
55 {
56 std::unordered_set<Counter<int>> m = {1, 2, 3, 4, 5, 6};
57 {
58 Counter<int> keys[] = {1, 2, 3, 4, 5, 6};
59 assert(Counter_base::gConstructed == 6+6);
60 test(m, std::begin(keys), std::end(keys));
61 }
62 assert(Counter_base::gConstructed == 0);
63 }
64
65 {
66 using min_alloc_set = std::unordered_set<int, std::hash<int>, std::equal_to<int>, min_allocator<int>>;
67 min_alloc_set m = {1, 2, 3, 4, 5, 6};
68 int keys[] = {1, 2, 3, 4, 5, 6};
69 test(m, std::begin(arr&: keys), std::end(arr&: keys));
70 }
71
72 return 0;
73}
74

source code of libcxx/test/std/containers/unord/unord.set/extract_key.pass.cpp