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79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
// (C) Copyright Matt Borland 2021.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include <cmath>
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#include <cfloat>
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#include <cstdint>
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#include <limits>
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#include <type_traits>
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#include <boost/math/ccmath/floor.hpp>
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#include <boost/math/ccmath/isnan.hpp>
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#include <boost/math/ccmath/isinf.hpp>
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#ifdef BOOST_HAS_FLOAT128
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#include <boost/multiprecision/float128.hpp>
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#endif
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template <typename T>
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constexpr void test()
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{
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if constexpr (std::numeric_limits<T>::has_quiet_NaN)
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{
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static_assert(boost::math::ccmath::isnan(boost::math::ccmath::floor(std::numeric_limits<T>::quiet_NaN())), "If x is NaN, NaN is returned");
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}
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static_assert(!boost::math::ccmath::floor(T(0)), "If x is +- 0, it is returned, unmodified");
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static_assert(!boost::math::ccmath::floor(T(-0)), "If x is +- 0, it is returned, unmodified");
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static_assert(boost::math::ccmath::isinf(boost::math::ccmath::floor(std::numeric_limits<T>::infinity())),
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"If x is +- inf, it is returned, unmodified");
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static_assert(boost::math::ccmath::isinf(boost::math::ccmath::floor(-std::numeric_limits<T>::infinity())),
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"If x is +- inf, it is returned, unmodified");
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static_assert(boost::math::ccmath::floor(T(1.0)) == T(1.0));
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static_assert(boost::math::ccmath::floor(T(2)) == T(2));
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static_assert(boost::math::ccmath::floor(T(2.4)) == T(2));
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static_assert(boost::math::ccmath::floor(T(2.9)) == T(2));
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static_assert(boost::math::ccmath::floor(T(-2.7)) == T(-3));
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static_assert(boost::math::ccmath::floor(T(-2)) == T(-2));
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using std::floor;
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constexpr T half_max_floor = boost::math::ccmath::floor(T((std::numeric_limits<T>::max)() / 2));
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static_assert(half_max_floor == (std::numeric_limits<T>::max)() / 2);
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BOOST_MATH_ASSERT(half_max_floor == floor((std::numeric_limits<T>::max)() / 2));
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constexpr T third_max_floor = boost::math::ccmath::floor(T((std::numeric_limits<T>::max)() / 3));
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static_assert(third_max_floor == (std::numeric_limits<T>::max)() / 3);
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BOOST_MATH_ASSERT(third_max_floor == floor((std::numeric_limits<T>::max)() / 3));
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constexpr T one_over_eps = boost::math::ccmath::floor(1 / T(std::numeric_limits<T>::epsilon()));
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static_assert(one_over_eps == 1 / T(std::numeric_limits<T>::epsilon()));
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BOOST_MATH_ASSERT(one_over_eps == floor(1 / T(std::numeric_limits<T>::epsilon())));
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}
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#if !defined(BOOST_MATH_NO_CONSTEXPR_DETECTION) && !defined(BOOST_MATH_USING_BUILTIN_CONSTANT_P)
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int main()
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{
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test<float>();
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test<double>();
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#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
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test<long double>();
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#endif
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#ifdef BOOST_HAS_FLOAT128
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test<boost::multiprecision::float128>();
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#endif
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return 0;
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}
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#else
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int main()
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{
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return 0;
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}
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#endif
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