The read/write operation structure.
Defined in <SDL3/SDL_iostream.h>
typedef struct SDL_IOStream SDL_IOStream;
This operates as an opaque handle. There are several APIs to create various types of I/O streams, or an app can supply an SDL_IOStreamInterface to SDL_OpenIO() to provide their own stream implementation behind this struct's abstract interface.
This struct is available since SDL 3.0.0.