[ CCode ( instance_pos = 2.9 ) ]
public delegate bool BufferForeachMetaFunc (Buffer buffer, out Meta? meta)
A function that will be called from foreach_meta.
The meta field will point to a the reference of the meta.
buffer should not be modified from this callback.
When this function returns true, the next meta will be returned. When false is returned,
foreach_meta will return.
When meta is set to null, the item will be removed from the buffer.
| buffer |
a Buffer |
| meta |
a pointer to a Meta |
| user_data |
user data passed to foreach_meta |
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