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