Generated CreateXDirect with std::span<T> or "T* + size" payloads

[pierricgimmig]

In generated C++ code, the CreateXDirect functions take in a payload of type const std::vector<uint8_t> *payload.

The caller doesn't always have a std::vector at hand, and creating one might not always be possible. In such cases, is there a way to call into a CreateXDirect function or equivalent without allocating?

If not, maybe adding a version of CreateXDirect functions that takes in a std::span or "T* + size" would be a good idea?

Thanks