37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
Plaintext
|
// (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
|