Wrapping a C++ function that takes an array via shared_ptr

[jiawen]

pybind11 newbie here. I Googled around but haven't found a definitive answer here. I have a C++ function whose interface looks something like this:

struct FloatArrayRef {
  float* base;
  int size;
};

void myFunc(std::shared_ptr<FloatArrayRef> input);

FloatArrayRef is just a pointer and count (a "view"). Normally, functions take FloatArrayRef by value and it works well. However, for my particular interface myFunc, it wants it by shared_ptr so that the caller has a chance to implement a custom deleter (e.g., the memory comes from a piece of hardware and this interface gives myFunc the opportunity to release an acquired lock as early as possible).

I'd like to call myFunc from Python using a ndarray. I imagine it's via the buffer protocol.

What's the best practice here?