###### (This is the legacy documentation for SDL2, the previous stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current stable version.)
# SDL_HintCallback

Type definition of the hint callback function.

## Header File

Defined in [SDL_hints.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_hints.h)

## Syntax

```c
typedef void (SDLCALL *SDL_HintCallback)(void *userdata, const char *name, const char *oldValue, const char *newValue);
```

## Function Parameters

|              |                                                                                |
| ------------ | ------------------------------------------------------------------------------ |
| **userdata** | what was passed as `userdata` to [SDL_AddHintCallback](SDL_AddHintCallback)(). |
| **name**     | what was passed as `name` to [SDL_AddHintCallback](SDL_AddHintCallback)().     |
| **oldValue** | the previous hint value.                                                       |
| **newValue** | the new value hint is to be set to.                                            |

----
[CategoryAPI](CategoryAPI), [CategoryAPIDatatype](CategoryAPIDatatype), [CategoryHints](CategoryHints)