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73 lines
2.3 KiB
C++
73 lines
2.3 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/scalbln.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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// Tests are only valid on binary systems
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if constexpr (FLT_RADIX == 2)
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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::scalbln(std::numeric_limits<T>::quiet_NaN(), 1l)), "If x is NaN, NaN is returned");
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}
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static_assert(!boost::math::ccmath::scalbln(T(0), 1l), "If x is +- 0, it is returned, unmodified");
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static_assert(!boost::math::ccmath::scalbln(T(-0), 1l), "If x is +- 0, it is returned, unmodified");
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static_assert(boost::math::ccmath::isinf(boost::math::ccmath::scalbln(std::numeric_limits<T>::infinity(), 1l)),
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"If x is +- inf, it is returned, unmodified");
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static_assert(boost::math::ccmath::isinf(boost::math::ccmath::scalbln(-std::numeric_limits<T>::infinity(), 1l)),
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"If x is +- inf, it is returned, unmodified");
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static_assert(boost::math::ccmath::scalbln(T(2), 0l) == T(2), "If exp is 0, then x is returned, unmodified");
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// 1 * 2^2 = 4
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static_assert(boost::math::ccmath::scalbln(T(1), 2l) == T(4));
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// 1.2 * 2^10 = 1228.8
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static_assert(boost::math::ccmath::scalbln(T(1.2), 10l) == T(1228.8));
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// 500 * 2^-2 = 125
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static_assert(boost::math::ccmath::scalbln(T(500), -2l) == T(125));
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}
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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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