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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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// template <class T>
// constexpr bool has_single_bit(T x) noexcept;
// Constraints: T is an unsigned integer type
#include <bit>
#include <cassert>
#include <cstdint>
#include <limits>
#include <type_traits>
#include "test_macros.h"
struct A {};
enum E1 : unsigned char { rEd };
enum class E2 : unsigned char { red };
template <class T>
constexpr bool test()
{
ASSERT_SAME_TYPE(decltype(std::has_single_bit(T())), bool);
ASSERT_NOEXCEPT(std::has_single_bit(T()));
T max = std::numeric_limits<T>::max();
assert(!std::has_single_bit(T(0)));
assert( std::has_single_bit(T(1)));
assert( std::has_single_bit(T(2)));
assert(!std::has_single_bit(T(3)));
assert( std::has_single_bit(T(4)));
assert(!std::has_single_bit(T(5)));
assert(!std::has_single_bit(T(6)));
assert(!std::has_single_bit(T(7)));
assert( std::has_single_bit(T(8)));
assert(!std::has_single_bit(T(9)));
assert(!std::has_single_bit(T(127)));
assert( std::has_single_bit(T(128)));
assert(!std::has_single_bit(T(129)));
assert(!std::has_single_bit(max));
#ifndef TEST_HAS_NO_INT128
if constexpr (std::is_same_v<T, __uint128_t>) {
T val = T(1) << 32;
assert(!std::has_single_bit(val-1));
assert( std::has_single_bit(val));
assert(!std::has_single_bit(val+1));
val <<= 60;
assert(!std::has_single_bit(val-1));
assert( std::has_single_bit(val));
assert(!std::has_single_bit(val+1));
T x = (T(1) << 63);
T y = (T(1) << 64);
assert( std::has_single_bit(x));
assert( std::has_single_bit(y));
assert(!std::has_single_bit(x + y));
}
#endif
return true;
}
int main(int, char**)
{
{
auto lambda = [](auto x) -> decltype(std::has_single_bit(x)) {};
using L = decltype(lambda);
static_assert(!std::is_invocable_v<L, signed char>);
static_assert(!std::is_invocable_v<L, short>);
static_assert(!std::is_invocable_v<L, int>);
static_assert(!std::is_invocable_v<L, long>);
static_assert(!std::is_invocable_v<L, long long>);
#ifndef TEST_HAS_NO_INT128
static_assert(!std::is_invocable_v<L, __int128_t>);
#endif
static_assert(!std::is_invocable_v<L, std::int8_t>);
static_assert(!std::is_invocable_v<L, std::int16_t>);
static_assert(!std::is_invocable_v<L, std::int32_t>);
static_assert(!std::is_invocable_v<L, std::int64_t>);
static_assert(!std::is_invocable_v<L, std::intmax_t>);
static_assert(!std::is_invocable_v<L, std::intptr_t>);
static_assert(!std::is_invocable_v<L, std::ptrdiff_t>);
static_assert(!std::is_invocable_v<L, bool>);
static_assert(!std::is_invocable_v<L, char>);
static_assert(!std::is_invocable_v<L, wchar_t>);
#ifndef TEST_HAS_NO_CHAR8_T
static_assert(!std::is_invocable_v<L, char8_t>);
#endif
static_assert(!std::is_invocable_v<L, char16_t>);
static_assert(!std::is_invocable_v<L, char32_t>);
static_assert(!std::is_invocable_v<L, A>);
static_assert(!std::is_invocable_v<L, A*>);
static_assert(!std::is_invocable_v<L, E1>);
static_assert(!std::is_invocable_v<L, E2>);
}
static_assert(test<unsigned char>());
static_assert(test<unsigned short>());
static_assert(test<unsigned int>());
static_assert(test<unsigned long>());
static_assert(test<unsigned long long>());
#ifndef TEST_HAS_NO_INT128
static_assert(test<__uint128_t>());
#endif
static_assert(test<std::uint8_t>());
static_assert(test<std::uint16_t>());
static_assert(test<std::uint32_t>());
static_assert(test<std::uint64_t>());
static_assert(test<std::uintmax_t>());
static_assert(test<std::uintptr_t>());
static_assert(test<std::size_t>());
test<unsigned char>();
test<unsigned short>();
test<unsigned int>();
test<unsigned long>();
test<unsigned long long>();
#ifndef TEST_HAS_NO_INT128
test<__uint128_t>();
#endif
test<std::uint8_t>();
test<std::uint16_t>();
test<std::uint32_t>();
test<std::uint64_t>();
test<std::uintmax_t>();
test<std::uintptr_t>();
test<std::size_t>();
return 0;
}
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