I vaguely understand the concept of an object graph. Does it only apply to in memory objects built via composition; or is inheritance a structual attribute of the graph as well?
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I vaguely understand the concept of an object graph. Does it only apply to in memory objects built via composition; or is inheritance a structual attribute of the graph as well?
Inheritance has nothing to do with an object graph. Think of an object graph as an “instance graph”, where vertices are instances, and (directed) edges are references between instances. The type of a particular instance has no bearing whatsoever on the graph; and yes, it is generally only built via composition.
The inheritance structure of a class is an entirely different concept that is often drawn as a graph (actually, with single-inheritance, it’s a tree). This is just a coincidence.