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46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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// vi: set et ts=4 sw=4 sts=4:
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/*
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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Consult the COPYING file in the top-level source directory of this
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module for the precise wording of the license and the list of
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copyright holders.
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*/
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/*!
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* \file
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* \copydoc sgn()
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*/
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#ifndef EWOMS_SIGNUM_HH
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#define EWOMS_SIGNUM_HH
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namespace Opm {
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/*!
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* \brief Template function which returns the sign of a floating point value
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*
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* This is a type safe and fast implementation of a sign() function for arbitrary
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* floating point values. It a slightly modified variant of
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*
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* https://stackoverflow.com/questions/1903954/is-there-a-standard-sign-function-signum-sgn-in-c-c
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*/
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template <class Scalar>
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int signum(Scalar val)
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{ return (0 < val) - (val < 0); }
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} // namespace Opm
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#endif
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