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https://issues.apache.org/jira/browse/ARROW-6399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17394111#comment-17394111
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Antoine Pitrou commented on ARROW-6399:
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{{Status}}, {{Result}} and {{Future}} are all declared {{ARROW_MUST_USE_TYPE}}
now.
> [C++] More extensive attributes usage could improve debugging
> -------------------------------------------------------------
>
> Key: ARROW-6399
> URL: https://issues.apache.org/jira/browse/ARROW-6399
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Ben Kietzman
> Priority: Minor
>
> Wrapping raw or smart pointer parameters and other declarations with
> {{gsl::not_null}} will assert they are not null. The check is dropped for
> release builds.
> Status is tagged with ARROW_MUST_USE_RESULT which emits warnings when a
> Status might be ignored if compiling with clang, but Result<> should probably
> be tagged with this too
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