BufferListDoFunction
Description:
public delegate weak Buffer BufferListDoFunction (
Buffer buffer)
A function for accessing the last buffer returned by next.
The function can leave buffer in the list, replace buffer in the list or remove buffer from the list,
depending on the return value. If the function returns NULL, buffer will be removed from the list, otherwise buffer
will be replaced with the returned buffer.
The last buffer returned by next will be replaced with the buffer
returned from the function. The function takes ownership of buffer and if a different value than buffer is returned,
buffer must be unreffed. If NULL is returned, the buffer will be removed from the list. The list must be writable.
Parameters:
| buffer |
the Buffer
|
| user_data |
user data |
Returns:
the buffer to replace buffer in the list, or NULL to remove buffer from the list |
