1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <functional>
11 
12 // class function<R(ArgTypes...)>
13 
14 // function(F);
15 
16 #include <functional>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 #include "count_new.hpp"
21 
22 class A
23 {
24     int data_[10];
25 public:
26     static int count;
27 
28     A()
29     {
30         ++count;
31         for (int i = 0; i < 10; ++i)
32             data_[i] = i;
33     }
34 
35     A(const A&) {++count;}
36 
37     ~A() {--count;}
38 
39     int operator()(int i) const
40     {
41         for (int j = 0; j < 10; ++j)
42             i += data_[j];
43         return i;
44     }
45 
46     int foo(int) const {return 1;}
47 };
48 
49 int A::count = 0;
50 
51 int g(int) {return 0;}
52 
53 #if TEST_STD_VER >= 11
54 struct RValueCallable {
55     template <class ...Args>
56     void operator()(Args&&...) && {}
57 };
58 struct LValueCallable {
59     template <class ...Args>
60     void operator()(Args&&...) & {}
61 };
62 #endif
63 
64 int main()
65 {
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