//=============================================================================
// Return all descendants of level i for a Particle
//=============================================================================
const LHCb::Particle::ConstVector ParticleDescendants::descendants(const LHCb::Particle* P, int maxlevel){
LHCb::Particle::ConstVector Parts ;
int level = 0 ;
bool found = false ;
LHCb::Particle::ConstVector mothers ;
do {
++level ;
LHCb::Particle::ConstVector leveldaughters ;
if ( level == 1 ) found = addDaughters( P, leveldaughters) ;
else found = addDaughters( mothers, leveldaughters) ;
if ( level==maxlevel || maxlevel == 0 ) {
Parts.insert(Parts.end(),leveldaughters.begin(),leveldaughters.end()) ;
verbose() << "Level: " << level << " - inserted " << leveldaughters.size()
<< " daughters to get " << Parts.size() << endmsg ;
}
verbose() << "Level " << level << " of " << maxlevel << " : "
<< leveldaughters.size() << " daughters " << found << endmsg ;
mothers = leveldaughters ;
} while ( (maxlevel<=0 || level<=maxlevel) && found ) ;
debug() << "Reached " << level << ". Returning " << Parts.size()
<< " daughters" << endmsg ;
return Parts ;
}
//=============================================================================
// Return all daughters of particles in a vector
//=============================================================================
bool ParticleDescendants::addDaughters(const LHCb::Particle* M,
LHCb::Particle::ConstVector& Parts){
if ( 0==M ) return false;
if ( M->isBasicParticle() ) return false;
const LHCb::Particle::ConstVector dauts = M->daughtersVector();
Parts.insert(Parts.end(),dauts.begin(),dauts.end());
verbose() << "Added " << dauts.size() << " daughters" << endmsg ;
return (!dauts.empty());
}