> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# PFMultiplayerFreeMemoryCallback

> A callback invoked every time a previously allocated memory buffer is no longer needed by the PlayFab Multiplayer library and can be freed.

A callback invoked every time a previously allocated memory buffer is no longer needed by the PlayFab Multiplayer library and can be freed.

## Syntax

```cpp theme={null}
typedef
void (*PFMultiplayerFreeMemoryCallback)(  
    void* pointer,  
    uint32_t memoryTypeId  
)  
```

### Parameters

**`pointer`**   void\*\
**Post\_invalid**

A pointer to a memory buffer previously allocated. This value will never be nullptr.

**`memoryTypeId`**   uint32\_t

An opaque identifier representing the PlayFab Multiplayer library internal category of memory being freed. This value should be ignored.

### Return value

Type: void

The callback does not return a value.

## Remarks

This callback is optionally installed using the [PFMultiplayerSetMemoryCallbacks()](/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/functions/pfmultiplayersetmemorycallbacks) method. <br /><br /> The callback is invoked whenever the PlayFab Multiplayer library has finished using a memory buffer previously returned by the title's corresponding [PFMultiplayerAllocateMemoryCallback](/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/callbacks/pfmultiplayerallocatememorycallback), so that the title can free the memory buffer.

## Requirements

**Header:** PFMultiplayer.h

## See also

[PFMultiplayer members](/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/pfmultiplayer_members)\
[PFMultiplayerAllocateMemoryCallback](/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/callbacks/pfmultiplayerallocatememorycallback)\
[PFMultiplayerSetMemoryCallbacks](/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/functions/pfmultiplayersetmemorycallbacks)


## Related topics

- [PFMultiplayerAllocateMemoryCallback](/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/callbacks/pfmultiplayerallocatememorycallback.md)
- [PFMultiplayerSetMemoryCallbacks](/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/functions/pfmultiplayersetmemorycallbacks.md)
- [PartyFreeMemoryCallback](/services/playfab/multiplayer/networking/reference/callbacks/partyfreememorycallback.md)
- [game_chat_free_memory_callback](/reference/chat/gamechat2/functions/game_chat_free_memory_callback.md)
- [PartyAllocateMemoryCallback](/services/playfab/multiplayer/networking/reference/callbacks/partyallocatememorycallback.md)