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File: isfinite.hpp
// (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) #ifndef BOOST_MATH_CCMATH_ISFINITE #define BOOST_MATH_CCMATH_ISFINITE #include <cmath> #include <type_traits> #include <boost/math/tools/is_constant_evaluated.hpp> #include <boost/math/ccmath/isinf.hpp> #include <boost/math/ccmath/isnan.hpp> namespace boost::math::ccmath { template <typename T> inline constexpr bool isfinite(T x) { if(BOOST_MATH_IS_CONSTANT_EVALUATED(x)) { // bool isfinite (IntegralType arg) is a set of overloads accepting the arg argument of any integral type // equivalent to casting the integral argument arg to double (e.g. static_cast<double>(arg)) if constexpr (std::is_integral_v<T>) { return !boost::math::ccmath::isinf(static_cast<double>(x)) && !boost::math::ccmath::isnan(static_cast<double>(x)); } else { return !boost::math::ccmath::isinf(x) && !boost::math::ccmath::isnan(x); } } else { using std::isfinite; if constexpr (!std::is_integral_v<T>) { return isfinite(x); } else { return isfinite(static_cast<double>(x)); } } } } #endif // BOOST_MATH_CCMATH_ISFINITE