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34 lines
1.0 KiB
34 lines
1.0 KiB
// (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(!detail::test_is_nan(result.imag()) && result.imag() <= 0) |
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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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