Structs with a retriever which depend on a parent value are difficult to define

[KSneijders]

(We discussed this in DM too, so this continues on top of that) (URL to DM)

The only work-around that has been working is the following:

This code is inside the __init__(...): of the child struct:

def __init__(self, struct_ver: Version = Version((0,)), parent: BaseStruct = None, idx: int = -1, initialise_defaults: bool = True, **retriever_inits):
    if parent is not None:
        Retriever.set_repeat(TerrainTables.terrain_restrictions, self, parent.terrain_count)
        Retriever.set_repeat(TerrainTables.terrain_pass_graphics, self, parent.terrain_count)
    super().__init__(struct_ver, parent, idx, initialise_defaults, **retriever_inits)

This doesn't feel like a proper solution in my opinion.

Could a feature (callback) be added for initializing that executes between __init__(...) and reading the retrievers?
It'd still need access to instance and parent variables etc.

Thanks!

[Divy1211]

Making a void Retriever at the very beginning to set repeat using struct.parent.value is currently the cleanest way to do this, although I admit it might not be the best, will look into potential solutions.

example of a void Retriever: #5