/*
  *  MoMEMta: a modular implementation of the Matrix Element Method
  *  Copyright (C) 2016  Universite catholique de Louvain (UCL), Belgium
  *
  *  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
  *  (at your option) 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/>.
  */
 
 #pragma once
 
 #ifndef MOMEMTA_MATRIXELEMENT_H
 #define MOMEMTA_MATRIXELEMENT_H
 
 #include <map>
 #include <utility>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include <momemta/MEParameters.h>
 #include <momemta/ParameterSet.h>
 
 namespace momemta {
     
     class MatrixElement {
         public:
             using Result = std::map<std::pair<int, int>, double>;
 
             MatrixElement() = default;
             virtual ~MatrixElement() {};
 
             virtual void resetHelicities() = 0;
     
             virtual Result compute(
                     const std::pair<std::vector<double>, std::vector<double>>& initialMomenta,
                     const std::vector<std::pair<int, std::vector<double>>>& finalState
                     ) = 0;
 
             virtual std::shared_ptr<MEParameters> getParameters() = 0;
     };
 
 }
 
 #endif