Add a combined version define in MaterialX C++

[ruiyang2021]

PR for #1609

Also added a simple test in source/MaterialXTest/MaterialXCore/Library.cpp. Let me know if that's unnecessary

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jstone-lucasfilm / name: Jonathan Stone (8541564, 8744ae9, e3fe0e3)
• ✅ login: ruiyang2021 / name: Rui Yang (b1f8248, 3dd8145)

[jstone-lucasfilm]

This looks very promising, @ruiyang2021, and I think the unit test makes a good addition (though we may want to refine exactly where it's added).

To resolve the EasyCLA error message above, feel free to follow the two links they provide in the message, and let us know how things go!

[ruiyang2021]

Gotcha, thank you! Going to sort the CLA with my manager. By the way, I'll be on holiday for 3 weeks starting from next Monday. Can come back to this one in 3 weeks if I have to leave something unfinished today

[ruiyang2021]

Hi @jstone-lucasfilm, I just passed the CLA check :)
Would it be better to add the test in Document.cpp instead? Maybe under "// Test version integers." or at the end of the file?

[jstone-lucasfilm]

Excellent, thanks @ruiyang2021!

For the location of the new test, I would actually recommend CoreUtil.cpp, which has tests for other MaterialXCore functions at global scope:

https://github.com/AcademySoftwareFoundation/MaterialX/blob/main/source/MaterialXTest/MaterialXCore/CoreUtil.cpp

[jstone-lucasfilm]

Great work, thanks @ruiyang2021!

[ruiyang2021]

Appreciate the help!