Integrator.h

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/*
 *  CepGen: a central exclusive processes event generator
 *  Copyright (C) 2022-2025  Laurent Forthomme
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef CepGen_Integration_Integrator_h
#define CepGen_Integration_Integrator_h
 
#include <functional>
 
#include "CepGen/Modules/NamedModule.h"
#include "CepGen/Utils/Limits.h"
#include "CepGen/Utils/Value.h"
 
namespace cepgen {
  class Integrand;
}  // namespace cepgen
 
namespace cepgen {
  class Integrator : public NamedModule<Integrator> {
  public:
    explicit Integrator(const ParametersList&);
 
    static ParametersDescription description();
 
    virtual bool oneDimensional() const { return false; }  
    virtual double eval(Integrand&, const std::vector<double>&) const;  
 
    Value integrate(Integrand& integrand, const std::vector<Limits>& = {});
    Value integrate(const std::function<double(double)>& integrand, const Limits& range_1d = {0., 1.});
    Value integrate(const std::function<double(const std::vector<double>&)>& integrand,
                    const std::vector<Limits>& range);
 
  protected:
    virtual Value run(Integrand& integrand, const std::vector<Limits>& range) = 0;
 
    const int verbosity_;  
  };
}  // namespace cepgen
 
#endif
    virtual double eval(Integrand&, const std::vector<double>&) const;   {…}
  class Integrator : public NamedModule<Integrator> {…};