blob: fd7d1413741c4bdb03f98d9526d14dfcea93559d [file] [log] [blame]
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <algorithm>
// __half_positive divides an integer number by 2 as unsigned number for known types.
// It can be an important optimization for lower bound, for example.
#include <algorithm>
#include <cassert>
#include <limits>
#include <type_traits>
#include "test_macros.h"
#include "user_defined_integral.h"
namespace {
template <class IntType, class UnderlyingType = IntType>
TEST_CONSTEXPR bool test(IntType max_v = IntType(std::numeric_limits<UnderlyingType>::max())) {
return std::__half_positive(max_v) == max_v / 2;
}
} // namespace
int main(int, char**)
{
{
assert(test<char>());
assert(test<int>());
assert(test<long>());
assert((test<UserDefinedIntegral<int>, int>()));
assert(test<size_t>());
#if !defined(_LIBCPP_HAS_NO_INT128)
assert(test<__int128_t>());
#endif // !defined(_LIBCPP_HAS_NO_INT128)
}
#if TEST_STD_VER >= 11
{
static_assert(test<char>(), "");
static_assert(test<int>(), "");
static_assert(test<long>(), "");
static_assert(test<size_t>(), "");
#if !defined(_LIBCPP_HAS_NO_INT128)
static_assert(test<__int128_t>(), "");
#endif // !defined(_LIBCPP_HAS_NO_INT128)
}
#endif // TEST_STD_VER >= 11
return 0;
}