preamble/discrete.h

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/* Please refer to:
 * https://pybind11.readthedocs.io/en/stable/advanced/cast/stl.html
 * These are required to save one copy operation on Python calls.
 *
 * NOTES
 * =================
 *
 * `PYBIND11_MAKE_OPAQUE` will mark the type as "opaque" for the pybind11
 * automatic STL binding, such that the raw objects can be accessed in Python.
 * Without this they will be automatically converted to a Python object, and all
 * mutations on Python side will not be reflected on C++.
 */

PYBIND11_MAKE_OPAQUE(gtsam::DiscreteKeys);