SDL_HintCallback - A callback used to send notifications of hint value changes.

       This datatype is available since SDL 3.2.0.

       This is called an initial time during

       SDL_AddHintCallback
        with the hint's current value, and then again each time the hint's value changes.

userdata
              what was passed as userdata to SDL_AddHintCallback ().

       name   what was passed as name to SDL_AddHintCallback ().

       oldValue
              the previous hint value.

       newValue
              the new value hint is to be set to.

       Defined in SDL3/SDL_hints.h

       SDL_HintCallback - A callback used to send notifications of hint value changes.

•(3), SDL_AddHintCallback(3)

Simple Directmedia Layer                           SDL 3.2.10                            SDL_HintCallback(3type)

#include"SDL3/SDL.h"typedefvoid(SDLCALL*SDL_HintCallback)(void*userdata,constchar*name,constchar*oldValue,constchar*newValue);

       This  callback  is  fired from whatever thread is setting a new hint value.  SDL holds a lock on the hint
       subsystem when calling this callback.