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 // test bitset<N>::reference operator[](size_t pos);
11 
12 #include <bitset>
13 #include <type_traits>
14 #include <cstdlib>
15 #include <cassert>
16 
17 #if defined(__clang__)
18 #pragma clang diagnostic ignored "-Wtautological-compare"
19 #endif
20 
21 template <std::size_t N>
22 std::bitset<N>
make_bitset()23 make_bitset()
24 {
25     std::bitset<N> v;
26     for (std::size_t i = 0; i < N; ++i)
27         v[i] = static_cast<bool>(std::rand() & 1);
28     return v;
29 }
30 
31 template <std::size_t N>
test_index_const()32 void test_index_const()
33 {
34     std::bitset<N> v1 = make_bitset<N>();
35     const bool greater_than_0 = std::integral_constant<bool, (N > 0)>::value; // avoid compiler warnings
36     if (greater_than_0)
37     {
38         assert(v1[N/2] == v1.test(N/2));
39         typename std::bitset<N>::reference r = v1[N/2];
40         assert(r == v1.test(N/2));
41         typename std::bitset<N>::reference r2 = v1[N/2];
42         r = r2;
43         assert(r == v1.test(N/2));
44         r = false;
45         assert(r == false);
46         assert(v1.test(N/2) == false);
47         r = true;
48         assert(r == true);
49         assert(v1.test(N/2) == true);
50         bool b = ~r;
51         assert(r == true);
52         assert(v1.test(N/2) == true);
53         assert(b == false);
54         r.flip();
55         assert(r == false);
56         assert(v1.test(N/2) == false);
57     }
58 }
59 
main()60 int main()
61 {
62     test_index_const<0>();
63     test_index_const<1>();
64     test_index_const<31>();
65     test_index_const<32>();
66     test_index_const<33>();
67     test_index_const<63>();
68     test_index_const<64>();
69     test_index_const<65>();
70     test_index_const<1000>();
71 }
72