Cpp check nodes

[quantumjim]

Summary

The check_nodes and is_cluster_neutral methods of ArcCircuit are reimplemented in C++.

[quantumjim]

I'd like to put a limit on this loop. @tommasopeduzzi Do you think the following would be enough?

        j = 0
        while self.odd_cluster_roots and j < 2 * self.code.d * (self.code.T + 1):
            self._grow_and_merge_clusters()
            j += 1

Or not enough? Or too much?

[tommasopeduzzi]

I'd like to put a limit on this loop. @tommasopeduzzi Do you think the following would be enough?

        j = 0
        while self.odd_cluster_roots and j < 2 * self.code.d * (self.code.T + 1):
            self._grow_and_merge_clusters()
            j += 1

Or not enough? Or too much?

Shouldn't be neccessary in theory, but the way you do it seems good to me.

[grace-harper]

LGTM!