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https://issues.apache.org/jira/browse/MESOS-1778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14133233#comment-14133233
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Alexander Rukletsov commented on MESOS-1778:
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I think it makes sense to embed it into the {{FlagsBase::add()}}, so we have
flag definition, default value and validation checks in the same place.
> Provide an option to validate flag value in stout/flags.
> ---------------------------------------------------------
>
> Key: MESOS-1778
> URL: https://issues.apache.org/jira/browse/MESOS-1778
> Project: Mesos
> Issue Type: Improvement
> Components: stout
> Reporter: Alexander Rukletsov
> Priority: Minor
>
> Currently we can provide the default value for a flag, but cannot check if
> the flag is set to a reasonable value and, e.g., issue a warning. Passing an
> optional lambda checker to {{FlagBase::add()}} can be a possible solution.
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