| // (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_ACOSH_INCLUDED | |
| #define BOOST_MATH_COMPLEX_ACOSH_INCLUDED | |
| #ifndef BOOST_MATH_COMPLEX_DETAILS_INCLUDED | |
| # include <boost/math/complex/details.hpp> | |
| #endif | |
| #ifndef BOOST_MATH_COMPLEX_ATANH_INCLUDED | |
| # include <boost/math/complex/acos.hpp> | |
| #endif | |
| namespace boost{ namespace math{ | |
| template<class T> | |
| inline std::complex<T> acosh(const std::complex<T>& z) | |
| { | |
| // | |
| // We use the relation acosh(z) = +-i acos(z) | |
| // Choosing the sign of multiplier to give real(acosh(z)) >= 0 | |
| // as well as compatibility with C99. | |
| // | |
| std::complex<T> result = boost::math::acos(z); | |
| if(!detail::test_is_nan(result.imag()) && result.imag() <= 0) | |
| return detail::mult_i(result); | |
| return detail::mult_minus_i(result); | |
| } | |
| } } // namespaces | |
| #endif // BOOST_MATH_COMPLEX_ACOSH_INCLUDED |