Avi Kivity a4c44cab88 treewide: update concepts language from the Concepts TS to C++20 ...

Seastar recently lost support for the experimental Concepts Technical
Specification (TS) and gained support for C++20 concepts. Re-enable
concepts in Scylla by updating our use of concepts to the C++20
standard.

This change:
 - peels off uses of the GCC6_CONCEPT macro
 - removes inclusions of <seastar/gcc6-concepts.hh>
 - replaces function-style concepts (no longer supported) with
   equation-style concepts
 - semicolons added and removed as needed
 - deprecated std::is_pod replaced by recommended replacement
 - updates return type constraints to use concepts instead of
   type names (either std::same_as or std::convertible_to, with
   std::same_as chosen when possible)

No attempt is made to improve the concepts; this is a specification
update only.
Message-Id: <20200531110254.2555854-1-avi@scylladb.com>

2020-06-02 09:12:21 +03:00

87 KiB

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