Benny Halevy 35256d1b92 treewide: explicitly use flat_mutation_reader_opt ...

Unlike flat_mutation_reader_opt that is defined using
optimized_optional<flat_mutation_reader>, std::optional<T> does not evaluate
to `false` after being moved, only after it is explicitly reset.

Use flat_mutation_reader_opt rather than std::optional<flat_mutation_reader>
to make it easier to check if it was closed before it's destroyed
or being assigned-over.

Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Message-Id: <20210215101254.480228-6-bhalevy@scylladb.com>

2021-02-17 17:57:34 +02:00

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