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>& 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>
make_bitset()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>
test_right_shift()31 void test_right_shift()
32 {
33     for (std::size_t s = 0; s <= N+1; ++s)
34     {
35         std::bitset<N> v1 = make_bitset<N>();
36         std::bitset<N> v2 = v1;
37         v1 >>= s;
38         for (std::size_t i = 0; i < N; ++i)
39             if (i + s < N)
40                 assert(v1[i] == v2[i + s]);
41             else
42                 assert(v1[i] == 0);
43     }
44 }
45 
main()46 int main()
47 {
48     test_right_shift<0>();
49     test_right_shift<1>();
50     test_right_shift<31>();
51     test_right_shift<32>();
52     test_right_shift<33>();
53     test_right_shift<63>();
54     test_right_shift<64>();
55     test_right_shift<65>();
56     test_right_shift<1000>();
57 }
58