# SDL_CleanupPropertyCallback

A callback used to free resources when a property is deleted.

## Header File

Defined in [<SDL3/SDL_properties.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_properties.h)

## Syntax

```c
typedef void (SDLCALL *SDL_CleanupPropertyCallback)(void *userdata, void *value);
```

## Function Parameters

|              |                                                   |
| ------------ | ------------------------------------------------- |
| **userdata** | an app-defined pointer passed to the callback.    |
| **value**    | the pointer assigned to the property to clean up. |

## Remarks

This should release any resources associated with `value` that are no
longer needed.

This callback is set per-property. Different properties in the same group
can have different cleanup callbacks.

This callback will be called _during_
[SDL_SetPointerPropertyWithCleanup](SDL_SetPointerPropertyWithCleanup) if
the function fails for any reason.

## Thread Safety

This callback may fire without any locks held; if this is a concern, the
app should provide its own locking.

## Version

This datatype is available since SDL 3.2.0.

## See Also

- [SDL_SetPointerPropertyWithCleanup](SDL_SetPointerPropertyWithCleanup)

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

