formulaEvaluatorBase.h

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#ifndef CommonTools_Utils_formulaEvaluatorBase_h
#define CommonTools_Utils_formulaEvaluatorBase_h
// -*- C++ -*-
//
// Package:     CommonTools/Utils
// Class  :     reco::formula::EvaluatorBase
// 
//
// Original Author:  Christopher Jones
//         Created:  Wed, 23 Sep 2015 16:26:00 GMT
//

// system include files
#include <vector>
#include <string>

// user include files

// forward declarations

namespace reco {
  namespace formula {
    std::vector<std::string> shiftAST(std::vector<std::string> child);
    class EvaluatorBase
    {
      
    public:
      enum class Precedence {
          kIdentity = 1,
          kComparison=2,
          kPlusMinus = 3,
          kMultDiv = 4,
          kPower = 5,
          kFunction = 6, //default
          kParenthesis = 7,
          kUnaryMinusOperator = 8
          };

      EvaluatorBase();
      EvaluatorBase(Precedence);
      virtual ~EvaluatorBase();
      
      // ---------- const member functions ---------------------
      //inputs are considered to be 'arrays' which have already been validated to 
      // be of the appropriate length
      virtual double evaluate(double const* iVariables, double const* iParameters) const = 0;
      virtual std::vector<std::string> abstractSyntaxTree() const = 0;

      unsigned int precedence() const { return m_precedence; }
      void setPrecedenceToParenthesis() { m_precedence = static_cast<unsigned int>(Precedence::kParenthesis); }

    private:
      EvaluatorBase(const EvaluatorBase&) = delete; 
      
      const EvaluatorBase& operator=(const EvaluatorBase&) = delete;
      
      // ---------- member data --------------------------------
      unsigned int m_precedence;
    };
  }
}


#endif