return custom struct as python object(which aslo could be none)

[linrongbin16]

I want to return a custom struct as a python object, which also could be none. I have tried two API:

struct Database {
  UserModel *get_user1(const std::string &user_name) const;
  std::optional<UserModel> get_user2(const std::string &user_name) const;
};

But it seems none of these two API works.
Would you please help me?

[linrongbin16]

Turns out it's my mistake. I didn't fetch the correct data element in mysql C connector's result set.

My C++ compiler/runtime(macOS clang-12) didn't throw any exception when I use the pybind11 built module.

And finally, both of these two API works correctly after I fix my bug:

• UserModel *get_user1(const std::string &user_name) const (create new instance and return to pybind11, return nullptr if no user exists)
• std::optional<UserModel> get_user2(const std::string &user_name) const (return copy of instance to pybind11, return std::nullopt if no user exists)

Personally, I prefer the second API since it's avoid raw pointer.