VipsCallbackFn

int
(* VipsCallbackFn) (
  void* a,
  void* b
)

No description available.

`a`	`void*`
	No description available.
	The argument can be `NULL`.
	The data is owned by the caller of the function.
`b`	`void*`
	No description available.
	The argument can be `NULL`.
	The data is owned by the caller of the function.

Returns:	`int`
	No description available.