virtual unsigned int GetImplicitHCount() const
Return the number of implicit hydrogens attached to atom. The default
value is zero. The ``implicit hydrogen count'' property may be set
using the OEAtomBase::SetImplicitHCount method. Implicit hydrogen
counts may also be set on a molecule using the function
OEAssignImplicitHydrogens. The implicit hydrogen count property
of an atom is a stored, not a computed, property. To calculate a
reasonable implicit hydrogen count for an atom from connectivity, use
the function OEDefaultImplicitHCount.
To convert explicit hydrogens to implicit hydrogens, use the OEChem
function OESupressHydrogens, and to convert implicit hydrogens
to explicit hydrogens, use the function OEAddExplicitHydrogens.