PFN_vkFreeFunction

The type of pfnFree is:

typedef void (VKAPI_PTR *PFN_vkFreeFunction)(void*                       pUserData, void*                       pMemory);

pub type PFN_vkFreeFunction = Option<
    unsafe extern "system" fn(

    ) -> std::ffi::c_void
>;

• pUserData is the value specified for VkAllocationCallbacks::pUserData in the allocator specified by the application.
• pMemory is the allocation to be freed.

pMemory may be NULL, which the callback must handle safely. If pMemory is non-NULL, it must be a pointer previously allocated by pfnAllocation or pfnReallocation. The application should free this memory.