AsyncFileState.fileCompletionCallback

void fileCompletionCallback(void *  context,  OVERLAPPED *  overlappedPtr,
          size_t bytesTransferred,  DWORD error)

static @trusted nothrow

Static IOCP completion callback.

Called by the IOCP backend when an overlapped file operation completes.

`context`	Pointer to the AsyncFileState.
`overlappedPtr`	OVERLAPPED that completed.
`bytesTransferred`	Bytes transferred by the operation.
`error`	Win32 error code (0 on success).