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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/math/special_functions/hypot.hpp')
-rw-r--r-- | src/third_party/boost-1.69.0/boost/math/special_functions/hypot.hpp | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/math/special_functions/hypot.hpp b/src/third_party/boost-1.69.0/boost/math/special_functions/hypot.hpp new file mode 100644 index 00000000000..efe1a3f2115 --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/math/special_functions/hypot.hpp @@ -0,0 +1,86 @@ +// (C) Copyright John Maddock 2005-2006. +// 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_HYPOT_INCLUDED +#define BOOST_MATH_HYPOT_INCLUDED + +#ifdef _MSC_VER +#pragma once +#endif + +#include <boost/math/tools/config.hpp> +#include <boost/math/tools/precision.hpp> +#include <boost/math/policies/error_handling.hpp> +#include <boost/math/special_functions/math_fwd.hpp> +#include <boost/config/no_tr1/cmath.hpp> +#include <algorithm> // for swap + +#ifdef BOOST_NO_STDC_NAMESPACE +namespace std{ using ::sqrt; using ::fabs; } +#endif + +namespace boost{ namespace math{ namespace detail{ + +template <class T, class Policy> +T hypot_imp(T x, T y, const Policy& pol) +{ + // + // Normalize x and y, so that both are positive and x >= y: + // + using std::fabs; using std::sqrt; // ADL of std names + + x = fabs(x); + y = fabs(y); + +#ifdef BOOST_MSVC +#pragma warning(push) +#pragma warning(disable: 4127) +#endif + // special case, see C99 Annex F: + if(std::numeric_limits<T>::has_infinity + && ((x == std::numeric_limits<T>::infinity()) + || (y == std::numeric_limits<T>::infinity()))) + return policies::raise_overflow_error<T>("boost::math::hypot<%1%>(%1%,%1%)", 0, pol); +#ifdef BOOST_MSVC +#pragma warning(pop) +#endif + + if(y > x) + (std::swap)(x, y); + + if(x * tools::epsilon<T>() >= y) + return x; + + T rat = y / x; + return x * sqrt(1 + rat*rat); +} // template <class T> T hypot(T x, T y) + +} + +template <class T1, class T2> +inline typename tools::promote_args<T1, T2>::type + hypot(T1 x, T2 y) +{ + typedef typename tools::promote_args<T1, T2>::type result_type; + return detail::hypot_imp( + static_cast<result_type>(x), static_cast<result_type>(y), policies::policy<>()); +} + +template <class T1, class T2, class Policy> +inline typename tools::promote_args<T1, T2>::type + hypot(T1 x, T2 y, const Policy& pol) +{ + typedef typename tools::promote_args<T1, T2>::type result_type; + return detail::hypot_imp( + static_cast<result_type>(x), static_cast<result_type>(y), pol); +} + +} // namespace math +} // namespace boost + +#endif // BOOST_MATH_HYPOT_INCLUDED + + + |