Functional.h

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/*
 *  CepGen: a central exclusive processes event generator
 *  Copyright (C) 2017-2024  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_Utils_Functional_h
#define CepGen_Utils_Functional_h
 
#include <array>
 
#include "CepGen/Modules/NamedModule.h"
 
namespace cepgen {
  class ParametersList;
  namespace utils {
    class Functional : public NamedModule<Functional> {
    public:
      explicit Functional(const ParametersList&);  
 
      static ParametersList fromExpression(const std::string& expr, const std::vector<std::string>& vars);
      static ParametersDescription description();
 
      double operator()(double x) const;
      double operator()(const std::vector<double>& x) const;
 
      inline const std::vector<std::string>& variables() const { return vars_orig_; }
      inline const std::string& expression() const { return expression_orig_; }
 
    protected:
      virtual double eval() const = 0;  
 
    private:
      std::vector<std::string> vars_orig_;  
      std::string expression_orig_;         
 
    protected:
      std::vector<std::string> vars_;       
      std::string expression_;              
      mutable std::vector<double> values_;  
    };
  }  // namespace utils
}  // namespace cepgen
 
#endif