virtual bool IsInRing() const
Return the Boolean ``in ring'' property of an atom. The default value
is false. The ``in ring'' property of an atom may be set using the
OEAtomBase::SetInRing
method. The ``in ring'' properties of atoms
and bonds are typically set by calling OEChem's
OEFindRingAtomsAndBonds
function. This is a stored, not a computed,
property.
To determine whether an atom is a member of a specific ring/cycle
size, use the function OEAtomIsInRingSize()
.