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