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 constexpr bool operator[](size_t pos) const;
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     const std::bitset<N> v1 = make_bitset<N>();
32     if (N > 0)
33     {
34         assert(v1[N/2] == v1.test(N/2));
35     }
36 }
37 
main()38 int main()
39 {
40     test_index_const<0>();
41     test_index_const<1>();
42     test_index_const<31>();
43     test_index_const<32>();
44     test_index_const<33>();
45     test_index_const<63>();
46     test_index_const<64>();
47     test_index_const<65>();
48     test_index_const<1000>();
49 }
50