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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 #include "test_macros.h"
17 
18 #if defined(TEST_COMPILER_CLANG)
19 #pragma clang diagnostic ignored "-Wtautological-compare"
20 #elif defined(TEST_COMPILER_C1XX)
21 #pragma warning(disable: 6294) // Ill-defined for-loop:  initial condition does not satisfy test.  Loop body not executed.
22 #endif
23 
24 template <std::size_t N>
25 std::bitset<N>
make_bitset()26 make_bitset()
27 {
28     std::bitset<N> v;
29     for (std::size_t i = 0; i < N; ++i)
30         v[i] = static_cast<bool>(std::rand() & 1);
31     return v;
32 }
33 
34 template <std::size_t N>
test_right_shift()35 void test_right_shift()
36 {
37     for (std::size_t s = 0; s <= N+1; ++s)
38     {
39         std::bitset<N> v1 = make_bitset<N>();
40         std::bitset<N> v2 = v1;
41         v1 >>= s;
42         for (std::size_t i = 0; i < N; ++i)
43             if (i + s < N)
44                 assert(v1[i] == v2[i + s]);
45             else
46                 assert(v1[i] == 0);
47     }
48 }
49 
main()50 int main()
51 {
52     test_right_shift<0>();
53     test_right_shift<1>();
54     test_right_shift<31>();
55     test_right_shift<32>();
56     test_right_shift<33>();
57     test_right_shift<63>();
58     test_right_shift<64>();
59     test_right_shift<65>();
60     test_right_shift<1000>();
61 }
62