Kefu Chai 8bab51733f db: add fmt::formatter for db::functions::function ...

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 define formatters for `db::functions::function`.
please note, because we use `std::ostream` as the parameter of
the polymorphism implementation of `function::print()`.
without an intrusive change, we have to use `fmt::ostream_formatter`
or at least use similar technique to format the `function` instance
into an instance of `ostream` first. so instead of implementing
a "native" `fmt::formatter`, in this change, we just use
`fmt::ostream_formatter`.

Refs #13245

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

Closes scylladb/scylladb#17832

2024-03-16 17:36:49 +02:00

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