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) 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_left_shift()29 void test_left_shift()
30 {
31     for (std::size_t s = 0; s <= N+1; ++s)
32     {
33         std::bitset<N> v1 = make_bitset<N>();
34         std::bitset<N> v2 = v1;
35         assert((v1 <<= s) == (v2 << s));
36     }
37 }
38 
main()39 int main()
40 {
41     test_left_shift<0>();
42     test_left_shift<1>();
43     test_left_shift<31>();
44     test_left_shift<32>();
45     test_left_shift<33>();
46     test_left_shift<63>();
47     test_left_shift<64>();
48     test_left_shift<65>();
49     test_left_shift<1000>();
50 }
51