'knows-a' and 'has-a' in OpenSees

[yaqiang.jiang]

Dear Frank and all,

I know the above relationships have different semantic meanings; however I can't find obvious differences in the implementation with C++. Take the Analysis object for instance, it knows a Domain object and has an AnalysisModel object, an Integrator object, etc. But in Analysis class, both the Domain object and other subordinate objects appear in pointer form. I just got confused......
Any of your comments will be appreciated.

[fmk]

there are no has-a and knows-a constructs in c++ .. all there is are pointers .. implementation and design have to be seperated.