aas-core-works / aas-core-codegen / 33802217174

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Simplify XML de-serialization in C++ (#673)

We refactor the C++ XML de-serialization to remove duplicated
boilerplate, mirroring the TypeScript (#671) and C# (#672)
simplifications.

List-item parsing was already factored out into a shared generic
`DeserializeList<T, DeserializeT>` helper before this change, so no
further work was needed there.

Concrete-class-from-element parsing was not: every generated
`{Cls}FromElement` function (one per class and interface -- 93 of
them for `aas_core_meta.v3` alone) inlined the same ~150 lines
skipping the BOF, reading the opening tag, looking up the model
type, dispatching to `{Cls}FromSequence`, and reading the closing
tag. We factor all of that into one shared generic
`DeserializeClassFromElement<T, DispatchT>` function; each
`{Cls}FromElement` now only supplies the small dispatch lambda
mapping model types to `{Cls}FromSequence` calls, plus the interface
name used in error messages.

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