Resource

A Resource is a type where its memory is controlled by SDL, usually with functions like SDL_Create*() and SDL_Destroy*().

To represent this type, we create RAII class where the Create* functions become its constructors and the Destroy is called by the destructor. Special *Param and *Ref exist to ease the use and allow flexibility on lifetime handling. Eg, for refcounted structs like SDL_Surface we get:

• Surface: the main class, with all wrapped methods inside it. Copying an object of it increments the refcount field. The surface is destroyed when the last instance goes out of scope.
• SurfaceParam, SurfaceConstParam: wrappers to allow interchangeable use of raw SDL_Surface and Surface as parameter.

For an opaque or non-refcounted type such as SDL_Window e get:

• Window: the main class, with all wrapped methods inside it. Copying it disallowed. When the instance goes out of scope it destroy the window.
• WindowRef: a non owned version, with same methods, but it can be copy and it does not destroy the window.
• WindowParam: a wrapper to allow interchangeable use of raw SDL_Window and Window and WindowRef as parameter.