Ichthyostega 8c046ee2ea Library: generalise into a fully copyable type ...

After exploring the »nested decorator-chain« implementation variant,
I decided to stick to the solution with the λ-vistor, while attempting
to level and smooth-out the design.
 * allow to engage ''any'' «slot» at construction
 * reverse the order of type parameters to be ascending (as in `std::tuple`)
 * make it fully copyable, movable, assignable and provide a `swap()`,
   relying on a variant of the "copy-and-swap"-idiom
 * add an ''cross-constructor'' for an extended branch set

2025-01-20 20:22:16 +01:00

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