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virtual unsigned int GetIdx() const
Return the bond index of an bond. This value is assigned by OEChem
when a bond is created. The bond index is unique for the bonds of a
given molecule, and is stable (not reused) for the lifetime of that
OEMolBase. These values may not be assigned sequentially, and may
contain gaps. Bond indices are guaranteed to be less than
OEMolBase::GetMaxBondIdx. Bond indices are typically only used
for efficiently storing data in arrays (or vectors) externally to the
OEMolBase. They arrays can be conveniently index via
OEBondBase::GetIdx(). For iterating across the bonds of a
molecule, use OEMolBase::GetBonds() and for keeping track of a
particular bond use its OEBondBase*.
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