Dimitri Vorona created ARROW-3662:
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Summary: [C++] Add a const overload to MemoryMappedFile::GetSize
Key: ARROW-3662
URL: https://issues.apache.org/jira/browse/ARROW-3662
Project: Apache Arrow
Issue Type: New Feature
Affects Versions: 0.11.1
Reporter: Dimitri Vorona
While GetSize in general is not a const function, it can be on a
MemoryMappedFile. I propose to add a const override directly to the
MemoryMappedFile.
Alternatively we could add a const version on the RandomAccessFile level which
would fail, if a const size getting (e.g. without a seek) isn't possible, but
it seems to me to be a potential source of hard-to-debug bugs and spurious
failures. At would at least require a careful analysis of the platform support
of different size getting options.
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