# OEAtomIsInRingSize¶

bool OEAtomIsInRingSize(const OEAtomBase *atm, unsigned int size)
bool OEAtomIsInRingSize(const OEAtomBase &atm, unsigned int size)


Determines whether the given atom is in a cycle of the specified size. If the atom is not in a ring, i.e. OEAtomBase.IsInRing returns false, then this function also returns false. This function also returns false for all values of size less than three.

Warning

It is necessary to perform ring perception by calling OEFindRingAtomsAndBonds function prior to calling OEAtomIsInRingSize function.