Integrand.h

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/*
 *  CepGen: a central exclusive processes event generator
 *  Copyright (C) 2013-2022  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_Integrand_h
#define CepGen_Integration_Integrand_h
 
#include <cstddef>  // size_t
#include <vector>
 
namespace cepgen {
  class Integrand {
  public:
    Integrand() = default;
    virtual ~Integrand() {}
 
    virtual double eval(const std::vector<double>&) = 0;
    virtual size_t size() const = 0;
    virtual bool hasProcess() const { return false; }
  };
}  // namespace cepgen
 
#endif