Ichthyostega
20392eee1c
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. |
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