/usr/include/trilinos/ROL_ScalarFunction.hpp is in libtrilinos-rol-dev 12.12.1-5.
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// Rapid Optimization Library (ROL) Package
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#ifndef ROL_SCALARFUNCTION_H
#define ROL_SCALARFUNCTION_H
/** \class ROL::ScalarFunction
\brief Provides interface for functions that map scalars to scalars.
*/
#include "ROL_Types.hpp"
namespace ROL {
template<class Real>
class ScalarFunction {
public:
virtual ~ScalarFunction() {}
virtual Real value(const Real alpha) = 0;
virtual Real deriv(const Real alpha) {
Real val1 = value(alpha);
Real eta = std::sqrt(ROL_EPSILON<Real>());
Real h = eta*(std::abs(alpha) > eta ? std::abs(alpha) : 1.0);
Real val0 = value(alpha+h);
return (val0-val1)/h;
}
};
}
#endif
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