/data/refman/pasoursint/CMSSW_4_4_5_patch3/src/DetectorDescription/ExprAlgo/interface/ClhepEvaluator.h

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#ifndef ClhepEvaluator_h
#define ClhepEvaluator_h


#include <vector>
#include <string>
#include "DetectorDescription/ExprAlgo/interface/ExprEvalInterface.h"
#include "CLHEP/Evaluator/Evaluator.h"


class ClhepEvaluator : public ExprEvalInterface
{
public:
 ClhepEvaluator();
  
  ~ClhepEvaluator();
  
  void set(const std::string & ns, const std::string & name, const std::string & exprValue);
   
  double eval(const std::string & ns, const std::string & expr);
  
  bool isDefined(const std::string & ns, //< current namespace
                 const std::string & name //< name of the variable inside current namespace
                 );

  const std::vector<std::string> & variables() const { return variables_;}
  const std::vector<std::string> & values() const { return values_;}
  

  double eval(const char * expression);
  
  void set(const std::string & name, const std::string & value);
  
  void clear();

private:
  void prepare(const std::string & ns,         // input
               const std::string & name,       // input
               const std::string & exprValue,  // input
               std::string & nameResult,       // output
               std::string & valResult) const; // output
               
  void throwex(const std::string & ns, 
               const std::string & name, 
               const std::string & expr,
               const std::string & reason,
               int idx=0) const;
               
  void checkname(const std::string & name) const;              
  
  HepTool::Evaluator evaluator_;        
  std::vector<std::string> variables_;
  std::vector<std::string> values_;         
};

#endif