#include <StringBasedNTupler.h>

Public Types
typedef TreeBranch::value	value

Public Member Functions
value	operator() ()

	StringLeaveHelper (const TreeBranch &B, const edm::Event &iEvent)

Private Attributes
value	value_

Detailed Description

template<typename Object>
class StringLeaveHelper< Object >

Definition at line 93 of file StringBasedNTupler.h.

Member Typedef Documentation

template<typename Object >

typedef TreeBranch::value StringLeaveHelper< Object >::value

Definition at line 95 of file StringBasedNTupler.h.

Constructor & Destructor Documentation

template<typename Object >

StringLeaveHelper< Object >::StringLeaveHelper	(	const TreeBranch &	B,
		const edm::Event &	iEvent
	)

inline

Definition at line 98 of file StringBasedNTupler.h.

References TreeBranch::className(), TreeBranch::expr(), edm::HandleBase::failedToGet(), edm::Event::getByLabel(), LogDebug, TreeBranch::src(), and StringLeaveHelper< Object >::value_.

     {
       const float defaultValue = 0.;
       //    grab the object
       edm::Handle<Object> oH;
       iEvent.getByLabel(B.src(), oH);
       //empty vector if product not found
       if (oH.failedToGet()){
     edm::LogError("StringBranchHelper")<<"cannot open: "<<B.src();
     value_.reset(new std::vector<float>(0));
       }
       else{
     //parser for the object expression
     StringObjectFunction<Object> expr(B.expr());
     //allocate enough memory for the data holder
     value_.reset(new std::vector<float>(1));
     try{
       (*value_)[0]=(expr)(*oH);
     }catch(...){
       LogDebug("StringLeaveHelper")<<"could not evaluate expression: "<<B.expr()<<" on class: "<<B.className();
       (*value_)[0]=defaultValue;
     }
       }
     }