// (C) Copyright John Maddock 2005.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MATH_COMPLEX_ACOSH_INCLUDED
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#define BOOST_MATH_COMPLEX_ACOSH_INCLUDED
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#ifndef BOOST_MATH_COMPLEX_DETAILS_INCLUDED
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# include <boost/math/complex/details.hpp>
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#endif
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#ifndef BOOST_MATH_COMPLEX_ATANH_INCLUDED
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# include <boost/math/complex/acos.hpp>
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#endif
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namespace boost{ namespace math{
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template<class T>
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inline std::complex<T> acosh(const std::complex<T>& z)
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{
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//
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// We use the relation acosh(z) = +-i acos(z)
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// Choosing the sign of multiplier to give real(acosh(z)) >= 0
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// as well as compatibility with C99.
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//
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std::complex<T> result = boost::math::acos(z);
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if(!(boost::math::isnan)(result.imag()) && signbit(result.imag()))
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return detail::mult_i(result);
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return detail::mult_minus_i(result);
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}
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} } // namespaces
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#endif // BOOST_MATH_COMPLEX_ACOSH_INCLUDED
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