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.hpp"
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     assert(globalMemCounter.checkOutstandingNewEq(0));
66     {
67     std::function<int(int)> f = A();
68     assert(A::count == 1);
69     assert(globalMemCounter.checkOutstandingNewEq(1));
70     assert(f.target<A>());
71     assert(f.target<int(*)(int)>() == 0);
72     }
73     assert(A::count == 0);
74     assert(globalMemCounter.checkOutstandingNewEq(0));
75     {
76     std::function<int(int)> f = g;
77     assert(globalMemCounter.checkOutstandingNewEq(0));
78     assert(f.target<int(*)(int)>());
79     assert(f.target<A>() == 0);
80     }
81     assert(globalMemCounter.checkOutstandingNewEq(0));
82     {
83     std::function<int(int)> f = (int (*)(int))0;
84     assert(!f);
85     assert(globalMemCounter.checkOutstandingNewEq(0));
86     assert(f.target<int(*)(int)>() == 0);
87     assert(f.target<A>() == 0);
88     }
89     {
90     std::function<int(const A*, int)> f = &A::foo;
91     assert(f);
92     assert(globalMemCounter.checkOutstandingNewEq(0));
93     assert(f.target<int (A::*)(int) const>() != 0);
94     }
95     {
96       std::function<void(int)> f(&g);
97       assert(f);
98       assert(f.target<int(*)(int)>() != 0);
99       f(1);
100     }
101     {
102         std::function <void()> f(static_cast<void (*)()>(0));
103         assert(!f);
104     }
105 #if TEST_STD_VER >= 11
106     {
107         using Fn = std::function<void(int, int, int)>;
108         static_assert(std::is_constructible<Fn, LValueCallable&>::value, "");
109         static_assert(std::is_constructible<Fn, LValueCallable>::value, "");
110         static_assert(!std::is_constructible<Fn, RValueCallable&>::value, "");
111         static_assert(!std::is_constructible<Fn, RValueCallable>::value, "");
112     }
113 #endif
114 
115   return 0;
116 }
117