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// Copyright Matt Borland 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)
#include <boost/math/special_functions/logistic_sigmoid.hpp>
#include <boost/multiprecision/cpp_bin_float.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include "math_unit_test.hpp"
#include <array>
#include <cfloat>
#include <cfenv>
#pragma STDC FENV_ACCESS ON
template <typename RealType>
void test()
{
const std::array<RealType, 5> x_values = {
0,
1,
1000,
0.5,
0.75
};
const std::array<RealType, 5> y_values = {
static_cast<RealType>(1) / 2,
static_cast<RealType>(0.73105857863000487925115924182183627436514464016505651927636590791904045307),
static_cast<RealType>(1),
static_cast<RealType>(0.62245933120185456463890056574550847875327936530891016305943716265854500),
static_cast<RealType>(0.6791786991753929731596801157765790212342212482195760219829517436805)
};
for (std::size_t i = 0; i < x_values.size(); ++i)
{
const RealType test_value {boost::math::logistic_sigmoid(x_values[i])};
BOOST_MATH_IF_CONSTEXPR (std::is_same<RealType, float>::value || std::is_same<RealType, double>::value)
{
CHECK_ULP_CLOSE(test_value, y_values[i], 1);
}
else
{
RealType comparison_value = y_values[i];
CHECK_MOLLIFIED_CLOSE(test_value, comparison_value, static_cast<RealType>(1e-15));
}
bool fe {false};
if (std::fetestexcept(FE_OVERFLOW))
{
fe = true; // LCOV_EXCL_LINE
std::cerr << "FE_OVERFLOW" << std::endl; // LCOV_EXCL_LINE
}
if (std::fetestexcept(FE_UNDERFLOW))
{
fe = true; // LCOV_EXCL_LINE
std::cerr << "FE_UNDERFLOW" << std::endl; // LCOV_EXCL_LINE
}
if (std::fetestexcept(FE_DIVBYZERO))
{
fe = true; // LCOV_EXCL_LINE
std::cerr << "FE_DIVBYZERO" << std::endl; // LCOV_EXCL_LINE
}
if (std::fetestexcept(FE_INVALID))
{
fe = true; // LCOV_EXCL_LINE
std::cerr << "FE_INVALID" << std::endl; // LCOV_EXCL_LINE
}
CHECK_EQUAL(fe, false);
}
}
int main()
{
std::feclearexcept(FE_ALL_EXCEPT);
test<float>();
std::feclearexcept(FE_ALL_EXCEPT);
test<double>();
std::feclearexcept(FE_ALL_EXCEPT);
test<long double>();
std::feclearexcept(FE_ALL_EXCEPT);
test<boost::multiprecision::cpp_bin_float_quad>();
test<boost::multiprecision::cpp_dec_float_50>();
return boost::math::test::report_errors();
}
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