[QUESTION] Why to use copy constructor if can write straight to the object

[amgross]

erpc/erpc_c/infra/erpc_message_buffer.hpp

Line 364 in 2890823

virtual MessageBuffer create(void) = 0;

How this API is currently, the user of it must have its own object, and the implementation of this API must create the object on its stack/global/whatever and then while returning copy constructor is called.

Why not to make it so the user jut give its object?
virtual MessageBuffer *create(MessageBuffer *buf) = 0;