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
18template <std::size_t N>
19void 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
40int 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