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// (C) Copyright Kilian Kilger 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)
#define BOOST_TEST_MAIN
#include <boost/test/unit_test.hpp>
#include <boost/test/tools/floating_point_comparison.hpp>
#include <boost/test/unit_test.hpp>
#include <boost/test/results_collector.hpp>
#include <boost/math/special_functions/gamma.hpp>
#include <boost/multiprecision/cpp_bin_float.hpp>
using namespace std;
using namespace boost::math;
using namespace boost::math::policies;
using namespace boost::multiprecision;
typedef policy<
policies::domain_error<errno_on_error>,
policies::pole_error<errno_on_error>,
policies::overflow_error<errno_on_error>,
policies::evaluation_error<errno_on_error>
> c_policy;
template<typename T>
struct test_lower
{
T operator()(T a, T x) const
{
return tgamma_lower(a, x, c_policy());
}
T expected(T a) const
{
return T(0.0);
}
};
template<typename T>
struct test_upper
{
T operator()(T a, T x) const
{
return tgamma(a, x, c_policy());
}
T expected(T a) const
{
return tgamma(a, c_policy());
}
};
template<typename T>
struct test_gamma_p
{
T operator()(T a, T x) const
{
return gamma_p(a, x, c_policy());
}
T expected(T) const
{
return T(0.0);
}
};
template<typename T>
struct test_gamma_q
{
T operator()(T a, T x) const
{
return gamma_q(a, x, c_policy());
}
T expected(T) const
{
return T(1.0);
}
};
template<typename T, template<typename> class Fun>
void test_impl(T a)
{
Fun<T> fn;
errno = 0;
T x = T(0.0);
T result = fn(a, x);
int saveErrno = errno;
errno = 0;
T expected = fn.expected(a);
BOOST_CHECK(errno == saveErrno);
BOOST_CHECK_EQUAL(result, expected);
}
template<template<typename> class Fun, typename T>
void test_type_dispatch(T val)
{
if (val <= (std::numeric_limits<float>::max)())
test_impl<float, Fun>(static_cast<float>(val));
if (val <= (std::numeric_limits<double>::max)())
test_impl<double, Fun>(static_cast<double>(val));
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
test_impl<long double, Fun>(static_cast<long double>(val));
#endif
test_impl<cpp_bin_float_50, Fun>(static_cast<cpp_bin_float_50>(val));
}
template<template<typename> class Fun>
void test_impl()
{
test_type_dispatch<Fun, double>(1.0);
test_type_dispatch<Fun, double>(0.1);
test_type_dispatch<Fun, double>(0.5);
test_type_dispatch<Fun, double>(0.6);
test_type_dispatch<Fun, double>(1.3);
test_type_dispatch<Fun, double>(1.5);
test_type_dispatch<Fun, double>(2);
test_type_dispatch<Fun, double>(100);
test_type_dispatch<Fun, double>((std::numeric_limits<float>::max)());
test_type_dispatch<Fun, double>((std::numeric_limits<double>::max)());
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
test_type_dispatch<Fun, long double>((std::numeric_limits<long double>::max)());
#endif
}
void test_derivative()
{
using namespace boost::math::detail;
double derivative = 0;
double result = gamma_incomplete_imp(1.0, 0.0, true, false, c_policy(), &derivative);
BOOST_CHECK(errno == 0);
BOOST_CHECK_EQUAL(derivative, tools::max_value<double>() / 2);
BOOST_CHECK_EQUAL(result, 0);
}
BOOST_AUTO_TEST_CASE( test_main )
{
test_impl<test_lower>();
test_impl<test_upper>();
test_impl<test_gamma_p>();
test_impl<test_gamma_q>();
test_derivative();
}
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