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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Fit/Residual/ScalarFunctionAdapter.h
//! @brief Defines class ScalarFunctionAdapter.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#ifdef SWIG
#error no need to expose this header to Swig
#endif // SWIG
#ifndef BORNAGAIN_FIT_RESIDUAL_SCALARFUNCTIONADAPTER_H
#define BORNAGAIN_FIT_RESIDUAL_SCALARFUNCTIONADAPTER_H
#include "Fit/Minimizer/Types.h"
#include "Fit/Param/Parameters.h"
#include "Fit/Residual/IFunctionAdapter.h"
#include <functional>
#include <memory>
#include <vector>
class RootScalarFunction;
namespace mumufit {
//! Converts user objective function to chi2 like function which ROOT expects.
//! More precisely, ROOT call to std::function<double(const double*)> will cause
//! the call of user function std::function<double(std::vector<double>)>, where
//! function input parameters will be current values fit parameters.
class ScalarFunctionAdapter : public IFunctionAdapter {
public:
ScalarFunctionAdapter(const fcn_scalar_t& func, const Parameters& parameters);
const RootScalarFunction* rootObjectiveFunction();
private:
fcn_scalar_t m_fcn; // user function to minimize
Parameters m_parameters;
std::unique_ptr<RootScalarFunction> m_root_objective;
};
} // namespace mumufit
#endif // BORNAGAIN_FIT_RESIDUAL_SCALARFUNCTIONADAPTER_H
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