[ CCode ( instance_pos = 2.9 ) ]
public delegate bool StructureFilterMapFunc (Quark field_id, ref Value value)
A function that will be called in filter_and_map_in_place.
The function may modify value, and the value will be removed from the structure if false is returned.
| field_id |
the Quark of the field name |
| value |
the Value of the field |
| user_data |
user data |
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