[newchem-cpp] convert dynamic_api.c to dynamic_api.cpp
#470
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For context, the gmock library is a component of googletest (it's already being installed). All this commit does is make it possible for us to use it in subsequent PRs
In the process, I actually identified and fixed a minor bug
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To be reviewed after #468 is merged
Before making any changes, I introduced a bunch of unit tests to test the API. Along the way, I actually identified a very minor edge case where our docs suggest that passing a
nullptras an argument should produce anullptrwhile we instead triggered a segmentation fault.Then I updated the logic. I needed to change the implementation. While what we were doing was valid C, it was almost certainly undefined behavior in C++.1
Footnotes
The code probably would have worked, but why risk it? The compiler implementers are free to do whatever they want when behavior is undefined. Plus, while the code may have worked today, this is the exact sort of thing that could break at an arbitrary time in the future ↩