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 // <functional>
10 
11 // class function<R(ArgTypes...)>
12 
13 // template <MoveConstructible  R, MoveConstructible ... ArgTypes>
14 //   void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&) noexcept;
15 
16 
17 #include <functional>
18 #include <cstdlib>
19 #include <cassert>
20 
21 #include "test_macros.h"
22 #include "count_new.h"
23 
24 class A
25 {
26     int data_[10];
27 public:
28     static int count;
29 
30     explicit A(int j)
31     {
32         ++count;
33         data_[0] = j;
34     }
35 
36     A(const A& a)
37     {
38         ++count;
39         for (int i = 0; i < 10; ++i)
40             data_[i] = a.data_[i];
41     }
42 
43     ~A() {--count;}
44 
45     int operator()(int i) const
46     {
47         for (int j = 0; j < 10; ++j)
48             i += data_[j];
49         return i;
50     }
51 
52     int id() const {return data_[0];}
53 };
54 
55 int A::count = 0;
56 
57 int g(int) {return 0;}
58 int h(int) {return 1;}
59 
60 int main(int, char**)
61 {
62     globalMemCounter.reset();
63     assert(globalMemCounter.checkOutstandingNewEq(0));
64     {
65     std::function<int(int)> f1 = A(1);
66     std::function<int(int)> f2 = A(2);
67 #if TEST_STD_VER >= 11
68     static_assert(noexcept(swap(f1, f2)), "" );
69 #endif
70     assert(A::count == 2);
71     assert(globalMemCounter.checkOutstandingNewEq(2));
72     assert(f1.target<A>()->id() == 1);
73     assert(f2.target<A>()->id() == 2);
74     swap(f1, f2);
75     assert(A::count == 2);
76     assert(globalMemCounter.checkOutstandingNewEq(2));
77     assert(f1.target<A>()->id() == 2);
78     assert(f2.target<A>()->id() == 1);
79     }
80     assert(A::count == 0);
81     assert(globalMemCounter.checkOutstandingNewEq(0));
82     {
83     std::function<int(int)> f1 = A(1);
84     std::function<int(int)> f2 = g;
85 #if TEST_STD_VER >= 11
86     static_assert(noexcept(swap(f1, f2)), "" );
87 #endif
88     assert(A::count == 1);
89     assert(globalMemCounter.checkOutstandingNewEq(1));
90     assert(f1.target<A>()->id() == 1);
91     assert(*f2.target<int(*)(int)>() == g);
92     swap(f1, f2);
93     assert(A::count == 1);
94     assert(globalMemCounter.checkOutstandingNewEq(1));
95     assert(*f1.target<int(*)(int)>() == g);
96     assert(f2.target<A>()->id() == 1);
97     }
98     assert(A::count == 0);
99     assert(globalMemCounter.checkOutstandingNewEq(0));
100     {
101     std::function<int(int)> f1 = g;
102     std::function<int(int)> f2 = A(1);
103 #if TEST_STD_VER >= 11
104     static_assert(noexcept(swap(f1, f2)), "" );
105 #endif
106     assert(A::count == 1);
107     assert(globalMemCounter.checkOutstandingNewEq(1));
108     assert(*f1.target<int(*)(int)>() == g);
109     assert(f2.target<A>()->id() == 1);
110     swap(f1, f2);
111     assert(A::count == 1);
112     assert(globalMemCounter.checkOutstandingNewEq(1));
113     assert(f1.target<A>()->id() == 1);
114     assert(*f2.target<int(*)(int)>() == g);
115     }
116     assert(A::count == 0);
117     assert(globalMemCounter.checkOutstandingNewEq(0));
118     {
119     std::function<int(int)> f1 = g;
120     std::function<int(int)> f2 = h;
121 #if TEST_STD_VER >= 11
122     static_assert(noexcept(swap(f1, f2)), "" );
123 #endif
124     assert(A::count == 0);
125     assert(globalMemCounter.checkOutstandingNewEq(0));
126     assert(*f1.target<int(*)(int)>() == g);
127     assert(*f2.target<int(*)(int)>() == h);
128     swap(f1, f2);
129     assert(A::count == 0);
130     assert(globalMemCounter.checkOutstandingNewEq(0));
131     assert(*f1.target<int(*)(int)>() == h);
132     assert(*f2.target<int(*)(int)>() == g);
133     }
134     assert(A::count == 0);
135     assert(globalMemCounter.checkOutstandingNewEq(0));
136 
137   return 0;
138 }
139