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