FunctionWrapper.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_Utils_FunctionWrapper_h
#define CepGen_Utils_FunctionWrapper_h
 
#include <functional>
 
#include "CepGen/Core/ParametersList.h"
 
namespace cepgen::utils {
  class FunctionWrapper {
  public:
    explicit FunctionWrapper(const std::function<double(double)>& func) : func_(func) {}
    explicit FunctionWrapper(const std::function<double(double, const ParametersList&)>& func) : func_params_(func) {}
    explicit FunctionWrapper(const std::function<double(double, void*)>& func) : func_obj_(func) {}
 
    inline double operator()(double x, const ParametersList& params = ParametersList()) const {
      if (func_params_)
        return func_params_(x, params);
      return func_(x);
    }
    inline double operator()(double x, const ParametersList& params = ParametersList()) const  {…}
    inline double operator()(double x, void* obj) const {
      if (func_obj_)
        return func_obj_(x, obj);
      return func_(x);
    }
    inline double operator()(double x, void* obj) const  {…}
    template <typename T>
    inline double operator()(double x, const T& obj) const {
      if (func_obj_)
        return func_obj_(x, dynamic_cast<void*>(&obj));
      if (func_params_)
        return func_params_(x, ParametersList().set("parameter", obj));
      return func_(x);
    }
    inline double operator()(double x, const T& obj) const  {…}
 
    inline operator const std::function<double(double)>&() { return func_; }
    inline operator const std::function<double(double, void*)>&() { return func_obj_; }
 
  private:
    std::function<double(double)> func_{nullptr};  
    std::function<double(double, const ParametersList&)> func_params_{nullptr};  
    std::function<double(double, void*)> func_obj_{nullptr};                     
  };
  class FunctionWrapper {…};
}  // namespace cepgen::utils
 
#endif