Efficient "parent" reference for structs

[tpolakovic]

@sstroemer

It’s hard to justify why I’m looking for that without sharing a large code base, but it boils down to the problem of many functions modifying the given struct . So basically I have many complex calculations, that each look like foo(model, component) , with component being of TypeX (with multiple types). Every TypeX has its own version of foo(...) (dispatched based on the component). Of course I could use a closure, which would be easy for a few functions that I need to wrap, but if each foo(...) possibly calls multiple bar(model, component) internally, that gets out of hand real quick.

I don’t understand the problem here. You need only one make_foo for all methods of foo because foo dispatches.