a90c6dd460
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// test unsigned long long to_ullong() const;
|
|
|
|
#include <bitset>
|
|
#include <algorithm>
|
|
#include <climits>
|
|
#include <cassert>
|
|
|
|
template <std::size_t N>
|
|
void test_to_ullong()
|
|
{
|
|
const std::size_t M = sizeof(unsigned long long) * CHAR_BIT < N ? sizeof(unsigned long long) * CHAR_BIT : N;
|
|
const std::size_t X = M == 0 ? sizeof(unsigned long long) * CHAR_BIT - 1 : sizeof(unsigned long long) * CHAR_BIT - M;
|
|
const unsigned long long max = M == 0 ? 0 : (unsigned long long)(-1) >> X;
|
|
unsigned long long tests[] = {0,
|
|
std::min<unsigned long long>(1, max),
|
|
std::min<unsigned long long>(2, max),
|
|
std::min<unsigned long long>(3, max),
|
|
std::min(max, max-3),
|
|
std::min(max, max-2),
|
|
std::min(max, max-1),
|
|
max};
|
|
for (std::size_t i = 0; i < sizeof(tests)/sizeof(tests[0]); ++i)
|
|
{
|
|
unsigned long long j = tests[i];
|
|
std::bitset<N> v(j);
|
|
assert(j == v.to_ullong());
|
|
}
|
|
}
|
|
|
|
int main()
|
|
{
|
|
test_to_ullong<0>();
|
|
test_to_ullong<1>();
|
|
test_to_ullong<31>();
|
|
test_to_ullong<32>();
|
|
test_to_ullong<33>();
|
|
test_to_ullong<63>();
|
|
test_to_ullong<64>();
|
|
test_to_ullong<65>();
|
|
test_to_ullong<1000>();
|
|
}
|