Uninitialized data member in test code

[jwakely]

https://github.com/oneapi-src/oneTBB/blob/1f52f5093ec7ce23829fe64ab82ac5541fea42ee/test/conformance/conformance_flowgraph.h#L335-L351

If I'm reading this correctly, the copy constructor does not initialize copies_count. That means if you make a copy of a copy, the new object will do ++other.copies_count; on an uninitialized variable.

Is there any reason not to initialize copies_count to zero here?

Using default member initializers for all four data members seems sensible.