62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// test unsigned long long to_ullong() const;
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#include <bitset>
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#include <algorithm>
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#include <type_traits>
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#include <climits>
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#include <cassert>
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#include "test_macros.h"
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template <std::size_t N>
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void test_to_ullong() {
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const std::size_t M = sizeof(unsigned long long) * CHAR_BIT < N ? sizeof(unsigned long long) * CHAR_BIT : N;
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const bool is_M_zero = std::integral_constant<bool, M == 0>::value; // avoid compiler warnings
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const std::size_t X = is_M_zero ? sizeof(unsigned long long) * CHAR_BIT - 1 : sizeof(unsigned long long) * CHAR_BIT - M;
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const unsigned long long max = is_M_zero ? 0 : (unsigned long long)(-1) >> X;
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unsigned long long tests[] = {
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0,
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std::min<unsigned long long>(1, max),
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std::min<unsigned long long>(2, max),
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std::min<unsigned long long>(3, max),
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std::min(max, max-3),
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std::min(max, max-2),
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std::min(max, max-1),
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max
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};
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for (std::size_t i = 0; i < sizeof(tests)/sizeof(tests[0]); ++i) {
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unsigned long long j = tests[i];
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std::bitset<N> v(j);
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assert(j == v.to_ullong());
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}
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{ // test values bigger than can fit into the bitset
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const unsigned long long val = 0x55AAAAFFFFAAAA55ULL;
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const bool canFit = N < sizeof(unsigned long long) * CHAR_BIT;
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const unsigned long long mask = canFit ? (1ULL << (canFit ? N : 0)) - 1 : (unsigned long long)(-1); // avoid compiler warnings
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std::bitset<N> v(val);
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assert(v.to_ullong() == (val & mask)); // we shouldn't return bit patterns from outside the limits of the bitset.
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}
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}
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int main(int, char**) {
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// test_to_ullong<0>();
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test_to_ullong<1>();
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test_to_ullong<31>();
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test_to_ullong<32>();
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test_to_ullong<33>();
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test_to_ullong<63>();
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test_to_ullong<64>();
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test_to_ullong<65>();
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test_to_ullong<1000>();
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return 0;
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}
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