Re: yet another time about TLorentzVector and TVector3

From: Martin Weber (Martin.Weber@cern.ch)
Date: Wed Nov 03 1999 - 12:38:54 MET 

Hi Pasha,

using inheritance raises more problems than it solves, e.g. the dot
product. Maybe you could make TVector3 a member of TLorentzVector:

class TLorentzVector {
  Double_t E;  // time / energy component
  TVector3 P;  // space / momentum component
....
};

This represents more the physical structure of TLorentzVector, which
consists of a TVector3 and another component, and has the advantage not to
create a temporary if you write

TVector3 & TLorentzVector::Vect() { return P; };

I don't see a problem writing

jet.Vect().DrEtaPhi(track)

then.

Martin

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