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ExpressionBinaryOperator.h

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#ifndef Utilities_ExpressionBinaryOperator_h
#define Utilities_ExpressionBinaryOperator_h
/* \class reco::parser::ExpressionBinaryOperator
 *
 * Binary Operator expression
 *
 * \author original version: Chris Jones, Cornell, 
 *         adapted to Reflex by Luca Lista, INFN
 *
 * \version $Revision: 1.2 $
 *
 */
#include "PhysicsTools/Utilities/src/ExpressionBase.h"
#include "PhysicsTools/Utilities/src/ExpressionStack.h"

namespace reco {
  namespace parser {
    template<typename Op>
    struct ExpressionBinaryOperator : public ExpressionBase {
      virtual double value(const ROOT::Reflex::Object& o) const { 
        return op_((*lhs_).value(o), (*rhs_).value(o));
      }
      ExpressionBinaryOperator(ExpressionStack & expStack) { 
        rhs_ = expStack.back(); expStack.pop_back();
        lhs_ = expStack.back(); expStack.pop_back();
      }
    private:
      Op op_;
      ExpressionPtr lhs_, rhs_;
    };
  }
}

#endif

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