Kefu Chai 21d55abe8b unimplemented: add format_as() for unimplemented::cause ...

before this change, we rely on the default-generated fmt::formatter
created from operator<<, but fmt v10 dropped the default-generated
formatter.

in this change, we replace operator<< with format_as() for
unimplemented::cause, so that we don't rely on the deprecated behavior,
and neither do we create a fully blown fmt::formatter. as in
fmt v10, format_as() can be used in place of fmt::formatter,
while in fmt v9, format_as() is only allowed to return a integer.
so, to be future-proof, and to be simpler, format_as() is used.
we can even replace `format_as(c)` with `c`, once fmt v10 is
available in future.

Refs #13245

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

Closes scylladb/scylladb#16866

2024-01-19 08:38:30 +02:00

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