class AtlEvtTreeInfo: public TNamed

 A++ event tree info object

 The event tree info is usually stored as static data member in the
 AtlEventHeader class (in the AOD2A++ converter as well as in the
 A++ analysis selector).


 ATHENA version


 The version number(s) of the ATHENA version used for the A++ event
 tree creation can be retrieved with the member functions
 AthenaVersionMajor(), AthenaVersionMinor(),
 AthenaVersionRevision(). The verion numbers are taken from the
 environment variables $AtlasVersion, $AtlasPatchVersion and $AtlasPatch

 Examples:
     AtlEvtTreeInfo *info = AtlEventHeader::GetEvtTreeInfo();
     cout << "ATHENA VERSION = "
	<< info->AthenaVersionMajor() << "."
 	<< info->AthenaVersionMinor() << "."
	<< info->AthenaVersionRevision() << endl;

     if ( inf->AthenaVersionMajor() >= 15 ) {
         // ATHENA release 15 and later ...
     }

     if ( inf->AthenaVersionMajor()    == 14 &&
          inf->AthenaVersionMinor()    == 5  &&
          inf->AthenaVersionRevision() == 0 ) {
          // ATHENA release 14.5.0 section ...
     }


 Author: Oliver Maria Kind <mailto: kind@mail.desy.de>
 Update: $Id: AtlEvtTreeInfo.cxx,v 1.5 2011/01/19 22:15:40 kind Exp $
 Copyright: 2009 (C) Oliver Maria Kind