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// (C) Copyright John Maddock 2023.
// 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 <iostream>
#include <iomanip>
#include <cfenv>
#include <boost/math/special_functions/beta.hpp>
using namespace std;
using namespace boost::math;
void show_fp_exception_flags()
{
if (std::fetestexcept(FE_DIVBYZERO)) {
cout << " FE_DIVBYZERO";
}
// FE_INEXACT is common and not interesting.
// if (std::fetestexcept(FE_INEXACT)) {
// cout << " FE_INEXACT";
// }
if (std::fetestexcept(FE_INVALID)) {
cout << " FE_INVALID";
}
if (std::fetestexcept(FE_OVERFLOW)) {
cout << " FE_OVERFLOW";
}
if (std::fetestexcept(FE_UNDERFLOW)) {
cout << " FE_UNDERFLOW";
}
cout << endl;
}
template <class Policy>
int test()
{
double a = 14.208308325339239;
double b = a;
double p = 6.4898872103239473e-300; // Throws exception: Assertion `x >= 0' failed.
// double p = 7.8e-307; // No flags set, returns 8.57354094063444939e-23
// double p = 7.7e-307; // FE_UNDERFLOW set, returns 0.0
while (p > (std::numeric_limits<double>::min)())
{
std::feclearexcept(FE_ALL_EXCEPT);
try {
double x = ibeta_inv(a, b, p, Policy());
show_fp_exception_flags();
std::cout << std::scientific << std::setw(24)
<< std::setprecision(17) << x << std::endl;
}
catch (const std::exception& e)
{
std::cout << e.what() << std::endl;
return 1;
}
p /= 1.25;
}
return 0;
}
int main(int argc, char* argv[])
{
using namespace boost::math::policies;
if (test<policy<>>())
return 1;
return test<policy<promote_double<false>>>();
}
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