mirror of
https://github.com/boostorg/math.git
synced 2026-07-22 13:34:12 +00:00
Matt Borland
64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
// (C) Copyright Christopher Kormanyos 2025.
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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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// See also: https://godbolt.org/z/nhMsKb8Yr
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#ifndef BOOST_MATH_STANDALONE
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#include <boost/core/lightweight_test.hpp>
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#endif
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#ifndef BOOST_MATH_BUILD_MODULE
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#include <boost/math/special_functions/bessel.hpp>
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#else
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import boost.math;
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#endif
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#ifdef BOOST_MATH_STANDALONE
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// Standalone/module builds cannot use Boost.Core; map lightweight_test onto math_unit_test.hpp.
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#include "math_unit_test.hpp"
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#define BOOST_TEST(expr) CHECK_TRUE((expr))
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namespace boost { inline int report_errors() { return ::boost::math::test::report_errors(); } }
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#endif
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#ifndef BOOST_MATH_BUILD_MODULE
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#include <cmath>
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#include <limits>
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#endif
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namespace local
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{
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template<typename FloatType>
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auto test() -> void
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{
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using float_type = FloatType;
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using std::ldexp;
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// N[BesselY[-1, (2875/1000) (2^(-128))], 51]
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// 7.53497332069250908152363321534337029122980775749906*10^37
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const float_type x { static_cast<float_type>(ldexp(2.875L, -128)) };
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constexpr float_type ctrl { static_cast<float_type>(7.53497332069250908152363321534337029122980775749906E37L) };
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const float_type result = ::boost::math::cyl_neumann(-1, x);
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constexpr float_type tol = std::numeric_limits<float_type>::epsilon() * 16;
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using ::std::fabs;
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BOOST_TEST(result > 0);
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BOOST_TEST(fabs(1 - (result / ctrl)) < tol);
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}
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} // namespace local
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auto main() -> int
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{
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local::test<double>();
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local::test<long double>();
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return boost::report_errors();
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}
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