1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
// (C) Copyright Christopher Kormanyos 2025.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See also: https://godbolt.org/z/nhMsKb8Yr
#include <boost/core/lightweight_test.hpp>
#include <boost/math/special_functions/bessel.hpp>
#include <cmath>
#include <limits>
namespace local
{
template<typename FloatType>
auto test() -> void
{
using float_type = FloatType;
using std::ldexp;
// N[BesselY[-1, (2875/1000) (2^(-128))], 51]
// 7.53497332069250908152363321534337029122980775749906*10^37
const float_type x { static_cast<float_type>(ldexp(2.875L, -128)) };
constexpr float_type ctrl { static_cast<float_type>(7.53497332069250908152363321534337029122980775749906E37L) };
const float_type result = ::boost::math::cyl_neumann(-1, x);
constexpr float_type tol = std::numeric_limits<float_type>::epsilon() * 16;
using ::std::fabs;
BOOST_TEST(result > 0);
BOOST_TEST(fabs(1 - (result / ctrl)) < tol);
}
} // namespace local
auto main() -> int
{
local::test<double>();
local::test<long double>();
return boost::report_errors();
}
|
