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 // function(F);
14 
15 #include <functional>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 #include "count_new.h"
20 
21 class A
22 {
23     int data_[10];
24 public:
25     static int count;
26 
27     A()
28     {
29         ++count;
30         for (int i = 0; i < 10; ++i)
31             data_[i] = i;
32     }
33 
34     A(const A&) {++count;}
35 
36     ~A() {--count;}
37 
38     int operator()(int i) const
39     {
40         for (int j = 0; j < 10; ++j)
41             i += data_[j];
42         return i;
43     }
44 
45     int foo(int) const {return 1;}
46 };
47 
48 int A::count = 0;
49 
50 int g(int) {return 0;}
51 
52 #if TEST_STD_VER >= 11
53 struct RValueCallable {
54     template <class ...Args>
55     void operator()(Args&&...) && {}
56 };
57 struct LValueCallable {
58     template <class ...Args>
59     void operator()(Args&&...) & {}
60 };
61 #endif
62 
63 int main(int, char**)
64 {
65     globalMemCounter.reset();
66     assert(globalMemCounter.checkOutstandingNewEq(0));
67     {
68     std::function<int(int)> f = A();
69     assert(A::count == 1);
70     assert(globalMemCounter.checkOutstandingNewEq(1));
71     assert(f.target<A>());
72     assert(f.target<int(*)(int)>() == 0);
73     }
74     assert(A::count == 0);
75     assert(globalMemCounter.checkOutstandingNewEq(0));
76     {
77     std::function<int(int)> f = g;
78     assert(globalMemCounter.checkOutstandingNewEq(0));
79     assert(f.target<int(*)(int)>());
80     assert(f.target<A>() == 0);
81     }
82     assert(globalMemCounter.checkOutstandingNewEq(0));
83     {
84     std::function<int(int)> f = (int (*)(int))0;
85     assert(!f);
86     assert(globalMemCounter.checkOutstandingNewEq(0));
87     assert(f.target<int(*)(int)>() == 0);
88     assert(f.target<A>() == 0);
89     }
90     {
91     std::function<int(const A*, int)> f = &A::foo;
92     assert(f);
93     assert(globalMemCounter.checkOutstandingNewEq(0));
94     assert(f.target<int (A::*)(int) const>() != 0);
95     }
96     {
97       std::function<void(int)> f(&g);
98       assert(f);
99       assert(f.target<int(*)(int)>() != 0);
100       f(1);
101     }
102     {
103         std::function <void()> f(static_cast<void (*)()>(0));
104         assert(!f);
105     }
106 #if TEST_STD_VER >= 11
107     {
108         using Fn = std::function<void(int, int, int)>;
109         static_assert(std::is_constructible<Fn, LValueCallable&>::value, "");
110         static_assert(std::is_constructible<Fn, LValueCallable>::value, "");
111         static_assert(!std::is_constructible<Fn, RValueCallable&>::value, "");
112         static_assert(!std::is_constructible<Fn, RValueCallable>::value, "");
113     }
114 #endif
115 
116   return 0;
117 }
118