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3rdparty/boost_1_81_0/boost/math/complex/atan.hpp 1.18 KB
63e88f80   Hu Chunming   提交三方库
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  //  (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