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:
11 
12 // bool operator==(const bitset<N>& rhs) const;
13 // bool operator!=(const bitset<N>& rhs) const;
14 
15 #include <bitset>
16 #include <cstdlib>
17 #include <cassert>
18 
19 #if defined(__clang__)
20 #pragma clang diagnostic ignored "-Wtautological-compare"
21 #endif
22 
23 template <std::size_t N>
24 std::bitset<N>
25 make_bitset()
26 {
27     std::bitset<N> v;
28     for (std::size_t i = 0; i < N; ++i)
29         v[i] = static_cast<bool>(std::rand() & 1);
30     return v;
31 }
32 
33 template <std::size_t N>
34 void test_equality()
35 {
36     const std::bitset<N> v1 = make_bitset<N>();
37     std::bitset<N> v2 = v1;
38     assert(v1 == v2);
39     if (N > 0)
40     {
41         v2[N/2].flip();
42         assert(v1 != v2);
43     }
44 }
45 
46 int main()
47 {
48     test_equality<0>();
49     test_equality<1>();
50     test_equality<31>();
51     test_equality<32>();
52     test_equality<33>();
53     test_equality<63>();
54     test_equality<64>();
55     test_equality<65>();
56     test_equality<1000>();
57 }
58