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(nullptr_t);
15 
16 // UNSUPPORTED: asan, msan
17 
18 #include <functional>
19 #include <new>
20 #include <cstdlib>
21 #include <cassert>
22 
23 int new_called = 0;
24 
25 void* operator new(std::size_t s) throw(std::bad_alloc)
26 {
27     ++new_called;
28     return std::malloc(s);
29 }
30 
31 void  operator delete(void* p) throw()
32 {
33     --new_called;
34     std::free(p);
35 }
36 
37 class A
38 {
39     int data_[10];
40 public:
41     static int count;
42 
43     A()
44     {
45         ++count;
46         for (int i = 0; i < 10; ++i)
47             data_[i] = i;
48     }
49 
50     A(const A&) {++count;}
51 
52     ~A() {--count;}
53 
54     int operator()(int i) const
55     {
56         for (int j = 0; j < 10; ++j)
57             i += data_[j];
58         return i;
59     }
60 
61     int foo(int) const {return 1;}
62 };
63 
64 int A::count = 0;
65 
66 int g(int) {return 0;}
67 
68 int main()
69 {
70     assert(new_called == 0);
71     {
72     std::function<int(int)> f = A();
73     assert(A::count == 1);
74     assert(new_called == 1);
75     assert(f.target<A>());
76     assert(f.target<int(*)(int)>() == 0);
77     }
78     assert(A::count == 0);
79     assert(new_called == 0);
80     {
81     std::function<int(int)> f = g;
82     assert(new_called == 0);
83     assert(f.target<int(*)(int)>());
84     assert(f.target<A>() == 0);
85     }
86     assert(new_called == 0);
87     {
88     std::function<int(int)> f = (int (*)(int))0;
89     assert(!f);
90     assert(new_called == 0);
91     assert(f.target<int(*)(int)>() == 0);
92     assert(f.target<A>() == 0);
93     }
94     {
95     std::function<int(const A*, int)> f = &A::foo;
96     assert(f);
97     assert(new_called == 0);
98     assert(f.target<int (A::*)(int) const>() != 0);
99     }
100 }
101