comparison DEPENDENCIES/generic/include/boost/math/complex/atan.hpp @ 16:2665513ce2d3

Add boost headers

+//  (C) Copyright John Maddock 2005.
+//  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_COMPLEX_ATAN_INCLUDED
+#define BOOST_MATH_COMPLEX_ATAN_INCLUDED
+
+#ifndef BOOST_MATH_COMPLEX_DETAILS_INCLUDED
+#  include <boost/math/complex/details.hpp>
+#endif
+#ifndef BOOST_MATH_COMPLEX_ATANH_INCLUDED
+#  include <boost/math/complex/atanh.hpp>
+#endif
+
+namespace boost{ namespace math{
+
+template<class T> 
+std::complex<T> atan(const std::complex<T>& x)
+{
+   //
+   // We're using the C99 definition here; atan(z) = -i atanh(iz):
+   //
+   if(x.real() == 0)
+   {
+      if(x.imag() == 1)
+         return std::complex<T>(0, std::numeric_limits<T>::has_infinity ? std::numeric_limits<T>::infinity() : static_cast<T>(HUGE_VAL));
+      if(x.imag() == -1)
+         return std::complex<T>(0, std::numeric_limits<T>::has_infinity ? -std::numeric_limits<T>::infinity() : -static_cast<T>(HUGE_VAL));
+   }
+   return ::boost::math::detail::mult_minus_i(::boost::math::atanh(::boost::math::detail::mult_i(x)));
+}
+
+} } // namespaces
+
+#endif // BOOST_MATH_COMPLEX_ATAN_INCLUDED