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// (C) Copyright Matt Borland 2021.
// 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 <cmath>
#include <cfloat>
#include <cstdint>
#include <limits>
#include <type_traits>
#include <boost/math/ccmath/remainder.hpp>
#include <boost/math/ccmath/isnan.hpp>
#include <boost/math/ccmath/isinf.hpp>
#ifdef BOOST_HAS_FLOAT128
#include <boost/multiprecision/float128.hpp>
#endif
#if !defined(BOOST_MATH_NO_CONSTEXPR_DETECTION) && !defined(BOOST_MATH_USING_BUILTIN_CONSTANT_P)
template <typename T>
constexpr void test()
{
// Error Handling
if constexpr (std::numeric_limits<T>::has_quiet_NaN)
{
static_assert(boost::math::ccmath::isnan(boost::math::ccmath::remainder(std::numeric_limits<T>::quiet_NaN(), T(1))), "If x is NaN, NaN is returned");
static_assert(boost::math::ccmath::isnan(boost::math::ccmath::remainder(T(1), std::numeric_limits<T>::quiet_NaN())), "If y is NaN, NaN is returned");
}
static_assert(boost::math::ccmath::isnan(boost::math::ccmath::remainder(std::numeric_limits<T>::infinity(), T(1))));
static_assert(boost::math::ccmath::isnan(boost::math::ccmath::remainder(-std::numeric_limits<T>::infinity(), T(1))));
static_assert(boost::math::ccmath::isnan(boost::math::ccmath::remainder(T(1), T(0))));
static_assert(boost::math::ccmath::isnan(boost::math::ccmath::remainder(T(1), T(-0))));
// Functionality
static_assert(boost::math::ccmath::remainder(T(6), T(2)) == T(0));
static_assert(boost::math::ccmath::remainder(T(3.0/2), T(1.0) == T(3.0/2)));
static_assert(boost::math::ccmath::remainder(T(7.0/3), T(2.0) == T(1.0/3)));
static_assert(boost::math::ccmath::remainder(T(-8.0/3), T(2.0) == T(-2.0/3)));
static_assert(boost::math::ccmath::remainder(T(-0), T(1)) == T(-0));
// Not exact values but pulled from https://en.cppreference.com/w/cpp/numeric/math/remainder as general functionality tests so allow for some error
// std::is_floating_point_v excludes multi-precision types
if constexpr (std::is_floating_point_v<T>)
{
static_assert(boost::math::ccmath::abs(boost::math::ccmath::remainder(T(5.1l), T(3.0l)) - T(-0.9l)) < 2*std::numeric_limits<T>::epsilon());
static_assert(boost::math::ccmath::abs(boost::math::ccmath::remainder(T(-5.1l), T(3.0l)) - T(0.9l)) < 2*std::numeric_limits<T>::epsilon());
static_assert(boost::math::ccmath::abs(boost::math::ccmath::remainder(T(5.1l), T(-3.0l)) - T(-0.9l)) < 2*std::numeric_limits<T>::epsilon());
static_assert(boost::math::ccmath::abs(boost::math::ccmath::remainder(T(-5.1l), T(-3.0l)) - T(0.9l)) < 2*std::numeric_limits<T>::epsilon());
}
// Correct promoted types
if constexpr (!std::is_same_v<T, float>)
{
constexpr auto test_type = boost::math::ccmath::remainder(T(1), 1.0f);
static_assert(std::is_same_v<T, std::remove_cv_t<decltype(test_type)>>);
}
else
{
constexpr auto test_type = boost::math::ccmath::remainder(1.0f, 1);
static_assert(std::is_same_v<double, std::remove_cv_t<decltype(test_type)>>);
}
}
int main()
{
test<float>();
test<double>();
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
test<long double>();
#endif
#ifdef BOOST_HAS_FLOAT128
test<boost::multiprecision::float128>();
#endif
return 0;
}
#else
int main()
{
return 0;
}
#endif
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