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
116 lines
2.9 KiB
C++
116 lines
2.9 KiB
C++
// Copyright John Maddock 2018.
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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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//
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// Tools for operator on complex as well as scalar types.
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//
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#ifndef BOOST_MATH_TOOLS_COMPLEX_HPP
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#define BOOST_MATH_TOOLS_COMPLEX_HPP
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#include <boost/math/tools/config.hpp>
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#include <boost/math/tools/is_detected.hpp>
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#ifdef BOOST_MATH_ENABLE_CUDA
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#include <cuda/std/utility>
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#include <cuda/std/complex>
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namespace boost {
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namespace math {
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template <typename T>
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using complex = cuda::std::complex<T>;
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} // namespace math
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} // namespace boost
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#else
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#include <utility>
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#include <complex>
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namespace boost {
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namespace math {
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template <typename T>
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using complex = std::complex<T>;
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} // namespace math
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} // namespace boost
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#endif
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namespace boost {
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namespace math {
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namespace tools {
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namespace detail {
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template <typename T, typename = void>
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struct is_complex_type_impl
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{
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static constexpr bool value = false;
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};
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#ifndef BOOST_MATH_ENABLE_CUDA
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template <typename T>
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struct is_complex_type_impl<T, void_t<decltype(std::declval<T>().real()),
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decltype(std::declval<T>().imag())>>
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{
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static constexpr bool value = true;
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};
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#else
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template <typename T>
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struct is_complex_type_impl<T, void_t<decltype(cuda::std::declval<T>().real()),
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decltype(cuda::std::declval<T>().imag())>>
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{
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static constexpr bool value = true;
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};
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#endif
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} // Namespace detail
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template <typename T>
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struct is_complex_type : public detail::is_complex_type_impl<T> {};
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//
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// Use this trait to typecast integer literals to something
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// that will interoperate with T:
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//
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template <class T, bool = is_complex_type<T>::value>
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struct integer_scalar_type
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{
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typedef int type;
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};
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template <class T>
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struct integer_scalar_type<T, true>
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{
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typedef typename T::value_type type;
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};
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template <class T, bool = is_complex_type<T>::value>
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struct unsigned_scalar_type
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{
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typedef unsigned type;
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};
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template <class T>
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struct unsigned_scalar_type<T, true>
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{
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typedef typename T::value_type type;
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};
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template <class T, bool = is_complex_type<T>::value>
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struct scalar_type
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{
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typedef T type;
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};
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template <class T>
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struct scalar_type<T, true>
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{
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typedef typename T::value_type type;
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};
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} } }
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#endif // BOOST_MATH_TOOLS_COMPLEX_HPP
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