#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 95 of file StringBasedNTupler.h.

Member Typedef Documentation

template<typename Object >

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

Definition at line 97 of file StringBasedNTupler.h.

Constructor & Destructor Documentation

template<typename Object >

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

inline

Definition at line 100 of file StringBasedNTupler.h.

References TreeBranch::className(), TreeBranch::expr(), edm::HandleBase::failedToGet(), edm::Event::getByLabel(), LogDebug, and TreeBranch::src().

                                                                  {
     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;
       }
     }
   }