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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// test unsigned long long to_ullong() const;
#include <bitset>
#include <algorithm>
#include <type_traits>
#include <climits>
#include <cassert>
#include "test_macros.h"
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 bool is_M_zero = std::integral_constant<bool, M == 0>::value; // avoid compiler warnings
const std::size_t X = is_M_zero ? sizeof(unsigned long long) * CHAR_BIT - 1 : sizeof(unsigned long long) * CHAR_BIT - M;
const unsigned long long max = is_M_zero ? 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());
}
{ // test values bigger than can fit into the bitset
const unsigned long long val = 0x55AAAAFFFFAAAA55ULL;
const bool canFit = N < sizeof(unsigned long long) * CHAR_BIT;
const unsigned long long mask = canFit ? (1ULL << (canFit ? N : 0)) - 1 : (unsigned long long)(-1); // avoid compiler warnings
std::bitset<N> v(val);
assert(v.to_ullong() == (val & mask)); // we shouldn't return bit patterns from outside the limits of the bitset.
}
}
int main(int, char**) {
// 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>();
return 0;
}
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