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unsigned int OEDetermineRingSystems(OEMolBase &mol, unsigned int *rings)
This function determines the ring systems of a molecule. The return value
is the number of connected components found in the molecule. If the molecule
is acyclic, the return value is zero. The ``rings'' array must contain
at least OEMolBase::GetMaxAtomIdx elements, and upon return it
contains a mapping indexed by OEAtomBase::GetIdx of which ring system
each atom is in.
The ring systems are numbered from one, up to an including the return value
of the function. Atoms that aren't contained in a ring, i.e. for which
OEAtomBase::IsInRing returns false, are mapped to the value zero.
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