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81 lines
2.2 KiB
C++
81 lines
2.2 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/frexp.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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inline constexpr T base_helper(const T val)
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{
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int i = 0;
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const T ans = boost::math::ccmath::frexp(val, &i);
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return ans;
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}
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template <typename T>
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inline constexpr int exp_helper(const T val)
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{
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int i = 0;
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boost::math::ccmath::frexp(val, &i);
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return i;
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}
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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(base_helper(std::numeric_limits<T>::quiet_NaN())), "If the arg is NaN, NaN is returned");
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}
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static_assert(!base_helper(T(0)), "If the arg is +- 0 the value is returned");
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static_assert(!base_helper(T(-0)), "If the arg is +- 0 the value is returned");
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static_assert(boost::math::ccmath::isinf(base_helper(std::numeric_limits<T>::infinity())), "If the arg is +- inf the value is returned");
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static_assert(boost::math::ccmath::isinf(base_helper(-std::numeric_limits<T>::infinity())), "If the arg is +- inf the value is returned");
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// N[125/32, 30]
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// 3.90625000000000000000000000000
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// 0.976562500000000000000000000000 * 2^2
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constexpr T test_base = base_helper(T(125.0/32));
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static_assert(test_base == T(0.9765625));
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constexpr int test_exp = exp_helper(T(125.0/32));
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static_assert(test_exp == 2);
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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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