585da50d7d
This PR adds the code of Boost.Math as of version 1.89 into the third-party directory, as discussed in a recent RFC [1]. The goal is for this code to be used as a back-end for the C++17 Math Special Functions. As explained in third-paty/README.md, this code is cleared for usage inside libc++ for the Math Special functions, however the LLVM Foundation should be consulted before using this code anywhere else in the LLVM project, due to the fact that it is under the Boost Software License (as opposed to the usual LLVM license). See the RFC [1] for more details. [1]: https://discourse.llvm.org/t/rfc-libc-taking-a-dependency-on-boost-math-for-the-c-17-math-special-functions
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
// (C) Copyright John Maddock 2005.
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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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#ifndef BOOST_MATH_COMPLEX_DETAILS_INCLUDED
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#define BOOST_MATH_COMPLEX_DETAILS_INCLUDED
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//
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// This header contains all the support code that is common to the
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// inverse trig complex functions, it also contains all the includes
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// that we need to implement all these functions.
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//
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#include <cmath>
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#include <complex>
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#include <limits>
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#include <boost/math/special_functions/sign.hpp>
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#include <boost/math/special_functions/fpclassify.hpp>
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#include <boost/math/constants/constants.hpp>
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namespace boost{ namespace math{ namespace detail{
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template <class T>
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inline T mult_minus_one(const T& t)
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{
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return (boost::math::isnan)(t) ? t : (boost::math::changesign)(t);
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}
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template <class T>
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inline std::complex<T> mult_i(const std::complex<T>& t)
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{
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return std::complex<T>(mult_minus_one(t.imag()), t.real());
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}
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template <class T>
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inline std::complex<T> mult_minus_i(const std::complex<T>& t)
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{
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return std::complex<T>(t.imag(), mult_minus_one(t.real()));
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}
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template <class T>
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inline T safe_max(T t)
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{
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return std::sqrt((std::numeric_limits<T>::max)()) / t;
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}
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inline long double safe_max(long double t)
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{
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// long double sqrt often returns infinity due to
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// insufficient internal precision:
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return std::sqrt((std::numeric_limits<double>::max)()) / t;
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}
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template <class T>
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inline T safe_min(T t)
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{
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return std::sqrt((std::numeric_limits<T>::min)()) * t;
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}
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inline long double safe_min(long double t)
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{
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// long double sqrt often returns zero due to
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// insufficient internal precision:
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return std::sqrt((std::numeric_limits<double>::min)()) * t;
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}
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} } } // namespaces
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#endif // BOOST_MATH_COMPLEX_DETAILS_INCLUDED
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