epoc32/include/stdapis/boost/math/complex/atan.hpp
author William Roberts <williamr@symbian.org>
Tue, 16 Mar 2010 16:12:26 +0000
branchSymbian2
changeset 2 2fe1408b6811
permissions -rw-r--r--
Final list of Symbian^2 public API header files
     1 //  (C) Copyright John Maddock 2005.
     2 //  Use, modification and distribution are subject to the
     3 //  Boost Software License, Version 1.0. (See accompanying file
     4 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
     5 
     6 #ifndef BOOST_MATH_COMPLEX_ATAN_INCLUDED
     7 #define BOOST_MATH_COMPLEX_ATAN_INCLUDED
     8 
     9 #ifndef BOOST_MATH_COMPLEX_DETAILS_INCLUDED
    10 #  include <boost/math/complex/details.hpp>
    11 #endif
    12 #ifndef BOOST_MATH_COMPLEX_ATANH_INCLUDED
    13 #  include <boost/math/complex/atanh.hpp>
    14 #endif
    15 
    16 namespace boost{ namespace math{
    17 
    18 template<class T> 
    19 std::complex<T> atan(const std::complex<T>& x)
    20 {
    21    //
    22    // We're using the C99 definition here; atan(z) = -i atanh(iz):
    23    //
    24    if(x.real() == 0)
    25    {
    26       if(x.imag() == 1)
    27          return std::complex<T>(0, std::numeric_limits<T>::has_infinity ? std::numeric_limits<T>::infinity() : static_cast<T>(HUGE_VAL));
    28       if(x.imag() == -1)
    29          return std::complex<T>(0, std::numeric_limits<T>::has_infinity ? -std::numeric_limits<T>::infinity() : -static_cast<T>(HUGE_VAL));
    30    }
    31    return ::boost::math::detail::mult_minus_i(::boost::math::atanh(::boost::math::detail::mult_i(x)));
    32 }
    33 
    34 } } // namespaces
    35 
    36 #endif // BOOST_MATH_COMPLEX_ATAN_INCLUDED