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* add cis and trans to bond stereo * compiles, does not work * tests all pass * Whitespace cleanup to recent changes. * C++ test case for Bond::setStereo using Bond::STEREOCIS and Bond::STEREOTRANS * Adding a PRECONDITION to Bond::setStereo to make sure the stereo atoms are already specified if CIS or TRANS is being specified. E/Z is technically defined by the topology of the molecule so the stereo atoms are redundant (easier to understand and use!), but ultimately redundant with the graph. However, CIS and TRANS is _only_ defined in this usage as the orientation of the atoms in the getStereoAtoms vector. * Exposing Bond::setStereo to Python and adding test cases to make sure it can be used to set CIS/TRANS stereochemistry. * verify substructure matching works * Adding Bond::setStereoAtoms to C++ Bond class. This allows setting the atoms to be considered for CIS or TRANS directly without a much more costly determination of ranking that E/Z requires. * Wrap Bond::SetStereoAtoms into python with a new type of test case. * docs