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 size_t count() 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_count()29 void test_count()
30 {
31     const std::bitset<N> v = make_bitset<N>();
32     std::size_t c1 = v.count();
33     std::size_t c2 = 0;
34     for (std::size_t i = 0; i < N; ++i)
35         if (v[i])
36             ++c2;
37     assert(c1 == c2);
38 }
39 
main()40 int main()
41 {
42     test_count<0>();
43     test_count<1>();
44     test_count<31>();
45     test_count<32>();
46     test_count<33>();
47     test_count<63>();
48     test_count<64>();
49     test_count<65>();
50     test_count<1000>();
51 }
52