C interface

[sethrj]

Closes #29

[sethrj]

@wongey Success! 🎉

[wongey]

@sethrj CQireeTest.Run doesn't pass when qsim is activated. Are we deferring the troubleshooting of the test to another PR, or is it not relevant for the functionality of the APIs and should be ignored for the CIs?

[sethrj]

@wongey It worked locally for me when I had qsim enabled... what result is it showing?

[wongey]

@sethrj Seems like it is a sorting issue maybe. Which is weird because I saw that you did sorted the results in 235. Also, max_count is reporting 1 (is it a std::size_t problem?).

[ RUN      ] CQireeTest.Run
qiree failure: num_shots was nonpositive
$HOME/qiree/test/cqiree/cqiree.test.cc:236: Failure
Expected equality of these values:
  (std::vector<ArrayUint2>{{0, 21}, {1, 32}, {2, 25}, {3, 22}})
    Which is: { { 0, 21 }, { 1, 32 }, { 2, 25 }, { 3, 22 } }
  arr_results
    Which is: { { 3, 22 }, { 0, 21 }, { 1, 32 }, { 2, 25 } }
qiree failure: insufficient capacity 1 for result items: need 4
[  FAILED  ] CQireeTest.Run (22 ms)

[sethrj]

Oh I see the problem; originally I copied the whole array into results but changed it to copy everything but the size. The sort mistakenly skips the first element again. So I'll fix that!

The "error" message you're seeing is just the printout from the test that's supposed to fail: the return code is correctly handled and the error message shoudl be ignored. (It's confusing I know, but trying to redirect the cerr output would require some extra hoops.)

[wongey]

Okay, I think we are good to go!