79 lines
3.0 KiB
C++
79 lines
3.0 KiB
C++
// @HEADER
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// ***********************************************************************
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//
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// Sacado Package
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// Copyright (2006) Sandia Corporation
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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// USA
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// Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
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// (etphipp@sandia.gov).
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//
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// ***********************************************************************
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// @HEADER
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#ifndef SACADO_CMATH_HPP
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#define SACADO_CMATH_HPP
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#include <cmath> // for most math functions
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#include "Sacado_ConfigDefs.h"
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// Define some math functions that aren't usually in cmath
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#if !( (defined(_GLIBCXX_USE_C99_MATH_TR1) && defined(__GXX_EXPERIMENTAL_CXX0X__)) || defined(HAVE_SACADO_CXX11) || defined(HAS_C99_TR1_CMATH) || defined(USER_DISABLE_SACADO_TR1_CMATH) )
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namespace std {
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inline float acosh(float x) {
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return std::log(x + std::sqrt(x*x - float(1.0))); }
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inline float asinh(float x) {
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return std::log(x + std::sqrt(x*x + float(1.0))); }
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inline float atanh(float x) {
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return float(0.5)*std::log((float(1.0)+x)/(float(1.0)-x)); }
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inline double acosh(double x) {
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return std::log(x + std::sqrt(x*x - double(1.0))); }
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inline double asinh(double x) {
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return std::log(x + std::sqrt(x*x + double(1.0))); }
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inline double atanh(double x) {
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return double(0.5)*std::log((double(1.0)+x)/(double(1.0)-x)); }
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}
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#endif // HAS_C99_TR1_CMATH
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namespace Sacado {
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// Replacement for ternary operator, for scalar types that don't implement
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// logical operations that return bool, e.g., a simd scalar type that returns
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// a simd bool. Sacado overloaded operators use this internally when ever
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// the ternary operator would be used. It can also be used by client code.
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template <typename Cond, typename T>
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SACADO_INLINE_FUNCTION
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T if_then_else(const Cond cond, const T& a, const T& b) {
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return cond ? a : b;
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}
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// Special version of sqrt(x) that avoids the NaN if x==0 in the derivative.
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// The default implementation just calls the standard sqrt(x).
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template <typename T>
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SACADO_INLINE_FUNCTION
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T safe_sqrt(const T& x) {
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using std::sqrt;
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return sqrt(x);
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}
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}
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#endif // SACADO_CMATH_HPP
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