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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Resample/Interparticle/IInterparticleStrategy.h
//! @brief Defines interface IInterparticleStrategy.
//!
//! @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_RESAMPLE_INTERPARTICLE_IINTERPARTICLESTRATEGY_H
#define BORNAGAIN_RESAMPLE_INTERPARTICLE_IINTERPARTICLESTRATEGY_H
#include "Base/Type/OwningVector.h"
#include "Resample/Option/SimulationOptions.h"
#include <heinz/Complex.h>
#include <memory>
#include <vector>
template <typename T> class IntegratorMCMiser;
class CoheringSubparticles;
class DiffuseElement;
class IInterference;
//! Abstract base class of DecouplingApproximationStrategy, SSCAStrategy.
//! Provides function 'evaluate' that computes the scattering from a decorated layer.
class IInterparticleStrategy {
public:
IInterparticleStrategy(const OwningVector<const CoheringSubparticles>& weighted_formfactors,
const SimulationOptions& options, bool polarized);
IInterparticleStrategy(IInterparticleStrategy&&);
virtual ~IInterparticleStrategy();
//! Calculates the intensity for scalar particles/interactions
double evaluate(const DiffuseElement& ele) const;
protected:
const OwningVector<const CoheringSubparticles>& m_weighted_formfactors;
const SimulationOptions m_options;
private:
double evaluateSinglePoint(const DiffuseElement& ele) const;
double MCIntegratedEvaluate(const DiffuseElement& ele) const;
double evaluate_for_fixed_angles(const double* fractions, size_t dim, const void* params) const;
//! Evaluates the intensity in the scalar case
virtual double scalarCalculation(const DiffuseElement& ele) const = 0;
//! Evaluates the intensity in the polarized case
virtual double polarizedCalculation(const DiffuseElement& ele) const = 0;
const bool m_polarized;
std::unique_ptr<IntegratorMCMiser<IInterparticleStrategy>> m_integrator;
};
#endif // BORNAGAIN_RESAMPLE_INTERPARTICLE_IINTERPARTICLESTRATEGY_H
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