Kefu Chai 007d7f1355 utils: add fmt::formatter for std::strong_ordering and friends ...

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

* std::strong_ordering
* std::weak_ordering
* std::partial_ordering

and their operator<<:s are moved to test/lib/test_utils.{hh,cc}, as they
are only used by Boost.test.

Refs #13245

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

2024-03-12 14:53:55 +08:00

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