Class UnusualOpRef

tests/pybind11_tests.h:57–66

};

class UnusualOpRef {
public:
    using NonTrivialType = std::shared_ptr<int>; // Almost any non-trivial type will do.
    // Overriding operator& should not break pybind11.
    NonTrivialType operator&() { return non_trivial_member; }
    NonTrivialType operator&() const { return non_trivial_member; }

private:
    NonTrivialType non_trivial_member;
};

/// Custom cast-only type that casts to a string "rvalue" or "lvalue" depending on the cast
/// context. Used to test recursive casters (e.g. std::tuple, stl containers).