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virtual bool SetBgn(OEAtomBase*bgn)
Define the ``begin'' (or ``source'') atom of a bond. Normally, the begin
atom of a bond is defined when the bond is created with
OEMolBase::NewBond. However, it is occasionally useful to defer
this decision, by passing the NULL pointer, (OEAtomBase*)0, as the
begin atom to OEMolBase::NewBond. The begin atom should then later
be specified by calling this method, OEBondBase::SetBgn, to resolve the
begin atom before the molecule is used. Note that it is not possible
to set/change the begin atom of a bond, once it has been defined. To
achieve the same behavior call the OEMolBase::DeleteBond method,
followed by OEMolBase::NewBond, to first destroy the original and
replace it with a new bond.
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