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https://issues.apache.org/jira/browse/MESOS-1742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14113151#comment-14113151
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Cody Maloney commented on MESOS-1742:
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Using directives don't greatly impact compile times as opposed to other items,
see https://issues.apache.org/jira/browse/MESOS-1734 for instance. In no
current compiler I've looked at is it the big speed problem, esp. compared to
code in headers and the like.
> Remove Using Directives
> -----------------------
>
> Key: MESOS-1742
> URL: https://issues.apache.org/jira/browse/MESOS-1742
> Project: Mesos
> Issue Type: Story
> Components: build
> Reporter: Jessica Hartog
> Labels: build
>
> We tell developers to follow the Google C++ Style Guide
> (http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml) which says,
> "Do not use a using-directive."
> At the moment 134 files in src/ do not conform to this practice.
> $ grep -r -l "using namespace" src | wc -l
> 134
> Using directives increase compile time by requiring a larger lookup space for
> unqualified ids.
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