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