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 unsigned long to_ulong() const;
11
12 #include <bitset>
13 #include <algorithm>
14 #include <limits>
15 #include <climits>
16 #include <cassert>
17
18 template <std::size_t N>
test_to_ulong()19 void test_to_ulong()
20 {
21 const std::size_t M = sizeof(unsigned long) * CHAR_BIT < N ? sizeof(unsigned long) * CHAR_BIT : N;
22 const std::size_t X = M == 0 ? sizeof(unsigned long) * CHAR_BIT - 1 : sizeof(unsigned long) * CHAR_BIT - M;
23 const std::size_t max = M == 0 ? 0 : std::size_t(std::numeric_limits<unsigned long>::max()) >> X;
24 std::size_t tests[] = {0,
25 std::min<std::size_t>(1, max),
26 std::min<std::size_t>(2, max),
27 std::min<std::size_t>(3, max),
28 std::min(max, max-3),
29 std::min(max, max-2),
30 std::min(max, max-1),
31 max};
32 for (std::size_t i = 0; i < sizeof(tests)/sizeof(tests[0]); ++i)
33 {
34 std::size_t j = tests[i];
35 std::bitset<N> v(j);
36 assert(j == v.to_ulong());
37 }
38 }
39
main()40 int main()
41 {
42 test_to_ulong<0>();
43 test_to_ulong<1>();
44 test_to_ulong<31>();
45 test_to_ulong<32>();
46 test_to_ulong<33>();
47 test_to_ulong<63>();
48 test_to_ulong<64>();
49 test_to_ulong<65>();
50 test_to_ulong<1000>();
51 }
52