/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/CommonTools/Utils/src/ExpressionVar.h

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#ifndef CommonTools_Utils_ExpressionVar_h
#define CommonTools_Utils_ExpressionVar_h
/* \class reco::parser::ExpressionVar
 *
 * Variable expression
 *
 * \author original version: Chris Jones, Cornell, 
 *         adapted by Luca Lista, INFN
 *
 * \version $Revision: 1.7 $
 *
 */
#include "CommonTools/Utils/src/ExpressionBase.h"
#include "CommonTools/Utils/src/TypeCode.h"
#include "CommonTools/Utils/src/MethodInvoker.h"
#include <vector>

namespace reco {
  namespace parser {
    struct ExpressionVar : public ExpressionBase {
      ExpressionVar(const std::vector<MethodInvoker> & methods, method::TypeCode retType);

      ~ExpressionVar() ;
      ExpressionVar(const ExpressionVar &var) ;

      virtual double value(const edm::ObjectWithDict & o) const;

      static bool isValidReturnType(method::TypeCode);
      static double objToDouble(const edm::ObjectWithDict &obj, method::TypeCode type) ;

      static bool makeStorage(edm::ObjectWithDict &obj, const edm::TypeWithDict &retType) ;
      static void delStorage(edm::ObjectWithDict &obj);

    private:
      std::vector<MethodInvoker>  methods_;
      mutable std::vector<edm::ObjectWithDict> objects_;
      mutable std::vector<bool>           needsDestructor_;
      method::TypeCode retType_;
      void initObjects_();
    }; 

  struct ExpressionLazyVar : public ExpressionBase {
      ExpressionLazyVar(const std::vector<LazyInvoker> & methods);
      ~ExpressionLazyVar() ;

      virtual double value(const edm::ObjectWithDict & o) const;

    private:
      std::vector<LazyInvoker> methods_;
      mutable std::vector<edm::ObjectWithDict> objects_;
  }; 

 }
}

#endif