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// <set>
12
13// class multiset
14
15// template <class C2>
16// void merge(set<Key, C2, Allocator>& source);
17// template <class C2>
18// void merge(set<Key, C2, Allocator>&& source);
19// template <class C2>
20// void merge(multiset<Key, C2, Allocator>& source);
21// template <class C2>
22// void merge(multiset<Key, C2, Allocator>&& source);
23
24#include <set>
25#include <cassert>
26#include "test_macros.h"
27#include "Counter.h"
28
29template <class Set>
30bool set_equal(const Set& set, Set other)
31{
32 return set == other;
33}
34
35#ifndef TEST_HAS_NO_EXCEPTIONS
36struct throw_comparator
37{
38 bool& should_throw_;
39
40 throw_comparator(bool& should_throw) : should_throw_(should_throw) {}
41
42 template <class T>
43 bool operator()(const T& lhs, const T& rhs) const
44 {
45 if (should_throw_)
46 throw 0;
47 return lhs < rhs;
48 }
49};
50#endif
51
52int main(int, char**)
53{
54 {
55 std::multiset<int> src{1, 3, 5};
56 std::multiset<int> dst{2, 4, 5};
57 dst.merge(source&: src);
58 assert(set_equal(src, {}));
59 assert(set_equal(dst, {1, 2, 3, 4, 5, 5}));
60 }
61
62#ifndef TEST_HAS_NO_EXCEPTIONS
63 {
64 bool do_throw = false;
65 typedef std::multiset<Counter<int>, throw_comparator> set_type;
66 set_type src({1, 3, 5}, throw_comparator(do_throw));
67 set_type dst({2, 4, 5}, throw_comparator(do_throw));
68
69 assert(Counter_base::gConstructed == 6);
70
71 do_throw = true;
72 try
73 {
74 dst.merge(src);
75 }
76 catch (int)
77 {
78 do_throw = false;
79 }
80 assert(!do_throw);
81 assert(set_equal(src, set_type({1, 3, 5}, throw_comparator(do_throw))));
82 assert(set_equal(dst, set_type({2, 4, 5}, throw_comparator(do_throw))));
83 }
84#endif
85 assert(Counter_base::gConstructed == 0);
86 struct comparator
87 {
88 comparator() = default;
89
90 bool operator()(const Counter<int>& lhs, const Counter<int>& rhs) const
91 {
92 return lhs < rhs;
93 }
94 };
95 {
96 typedef std::multiset<Counter<int>, std::less<Counter<int>>> first_set_type;
97 typedef std::multiset<Counter<int>, comparator> second_set_type;
98 typedef std::set<Counter<int>, comparator> third_set_type;
99
100 {
101 first_set_type first{1, 2, 3};
102 second_set_type second{2, 3, 4};
103 third_set_type third{1, 3};
104
105 assert(Counter_base::gConstructed == 8);
106
107 first.merge(second);
108 first.merge(third);
109
110 assert(set_equal(first, {1, 1, 2, 2, 3, 3, 3, 4}));
111 assert(set_equal(second, {}));
112 assert(set_equal(third, {}));
113
114 assert(Counter_base::gConstructed == 8);
115 }
116 assert(Counter_base::gConstructed == 0);
117 {
118 first_set_type first{1, 2, 3};
119 second_set_type second{2, 3, 4};
120 third_set_type third{1, 3};
121
122 assert(Counter_base::gConstructed == 8);
123
124 first.merge(std::move(second));
125 first.merge(std::move(third));
126
127 assert(set_equal(first, {1, 1, 2, 2, 3, 3, 3, 4}));
128 assert(set_equal(second, {}));
129 assert(set_equal(third, {}));
130
131 assert(Counter_base::gConstructed == 8);
132 }
133 assert(Counter_base::gConstructed == 0);
134 }
135 {
136 std::multiset<int> first;
137 {
138 std::multiset<int> second;
139 first.merge(source&: second);
140 first.merge(source: std::move(second));
141 }
142 {
143 std::set<int> second;
144 first.merge(source&: second);
145 first.merge(source: std::move(second));
146 }
147 }
148 return 0;
149}
150

source code of libcxx/test/std/containers/associative/multiset/merge.pass.cpp