Ichthyostega 20392eee1c clean-up: successfully replaced the old fixed type sequence (closes: #987) ...

This resolves an intricate problem related to metaprogramming with
variadic templates and function signatures. Due to exceptional complexity,
a direct solution was blocked for several years, and required a better
organisation of the support code involved; several workarounds were
developed, gradually leading to a transition path, which could now
be completed in an focused clean-up effort over the last week.

Metaprogramming with sequences of types is organised into three layers:
- simple tasks can be solved with the standard facilities of the language,
  using pattern match with variadic template specialisations
- the ''type-sequence'' construct `Types<T...>` takes the centre stage
  for the explicit definition of collections of types; it can be re-bound
  to other variadic templates and supports simple direct manipulation
- for more elaborate and advanced processing tasks, a ''Loki-style type list''
  can be obtained from a type-sequence, allowing to perform recursive
  list processing task with a technique similar to LISP.

2025-06-07 18:04:59 +02:00

9.7 MiB

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