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Draft: use C++20 to streamline functors

Gerhard Raven requested to merge factor-functor-preparation-of-composite-functors-c++20 into 2024-patches

superset of !3993 (merged):

  • use C++20 requires instead of SFINAE to constrain templates.
  • use C++20 perfect parameter pack captures in lambdas

NOTE: as a result of the above, building the code on the x86_64_v3-el9-gcc12+cuda12_1-opt+g platform will fail (if there is a very good reason to do so, this could be worked around by using the preprocessor to basically keep the 'old' code for any non-C++20 platform)

Edited by Gerhard Raven

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