| [section:sign_functions Sign Manipulation Functions] |
| |
| [h4 Synopsis] |
| |
| `` |
| #include <boost/math/special_functions/sign.hpp> |
| `` |
| |
| namespace boost{ namespace math{ |
| |
| template<class T> |
| int signbit(T x); |
| |
| template <class T> |
| inline int sign (const T& z); |
| |
| template <class T> |
| inline T copysign (const T& x, const T& y); |
| |
| }} // namespaces |
| |
| [h4 Description] |
| |
| template<class T> |
| int signbit(T x); |
| |
| Returns a non-zero value if the sign bit is set in variable /x/, otherwise `0`. |
| |
| template <class T> |
| inline int sign (const T& z); |
| |
| Returns `1` if `x > 0`, `-1` if `x < 0`, and `0` if x is zero. |
| |
| template <class T> |
| inline T copysign (const T& x, const T& y); |
| |
| Sets the sign of /x/ to be the same as the sign of /y/. |
| |
| [endsect][/section:sign_functions Sign Manipulation Functions] |
| [/ |
| Copyright 2006 John Maddock and Paul A. Bristow. |
| Distributed under 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). |
| ] |
| |
