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61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
// (C) Copyright Matt Borland 2021.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include <cmath>
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#include <cfloat>
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#include <cstdint>
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#include <limits>
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#include <type_traits>
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#include <boost/math/ccmath/logb.hpp>
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#include <boost/math/ccmath/isnan.hpp>
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#include <boost/math/ccmath/isinf.hpp>
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#ifdef BOOST_HAS_FLOAT128
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#include <boost/multiprecision/float128.hpp>
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#endif
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template <typename T>
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constexpr void test()
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{
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if constexpr (std::numeric_limits<T>::has_quiet_NaN)
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{
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static_assert(boost::math::ccmath::isnan(boost::math::ccmath::logb(std::numeric_limits<T>::quiet_NaN())), "if arg is NaN, NaN is returned");
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}
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static_assert(boost::math::ccmath::isinf(boost::math::ccmath::logb(T(0))), "If arg is +-0, -infinity is returned");
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static_assert(boost::math::ccmath::isinf(boost::math::ccmath::logb(T(-0))), "If arg is +-0, -infinity is returned");
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static_assert(boost::math::ccmath::isinf(boost::math::ccmath::logb(std::numeric_limits<T>::infinity())),
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"if arg is +-infinity, infinity is returned");
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static_assert(boost::math::ccmath::isinf(boost::math::ccmath::logb(-std::numeric_limits<T>::infinity())),
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"if arg is +-infinity, infinity is returned");
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// 123.45 = 1.92891 * 2^6
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constexpr T test_exp = boost::math::ccmath::logb(T(123.45));
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static_assert(test_exp == T(6));
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}
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#if !defined(BOOST_MATH_NO_CONSTEXPR_DETECTION) && !defined(BOOST_MATH_USING_BUILTIN_CONSTANT_P)
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int main()
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{
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test<float>();
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test<double>();
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#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
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test<long double>();
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#endif
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#ifdef BOOST_HAS_FLOAT128
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test<boost::multiprecision::float128>();
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#endif
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return 0;
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}
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#else
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int main()
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{
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return 0;
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}
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#endif
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