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https://issues.apache.org/jira/browse/MESOS-2211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14271949#comment-14271949
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Cody Maloney commented on MESOS-2211:
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+1 for `#pragma once`. It isn't standard C++, but every C++11 compiler supports
them (And some that don't support C++11)
Major improvements
- Hard to mess up (There are special shortcut parsing paths around #pramga
once and include guards inside compilers which give a large compile speed
improvement)
- There aren't conflicts with C++ reserved identifiers
(http://stackoverflow.com/questions/228783/what-are-the-rules-about-using-an-underscore-in-a-c-identifier)
Underscore followed by upper case letter (our current scheme) is a language
reserved keyword.
> Include guard naming fixup
> --------------------------
>
> Key: MESOS-2211
> URL: https://issues.apache.org/jira/browse/MESOS-2211
> Project: Mesos
> Issue Type: Bug
> Reporter: Till Toenshoff
> Priority: Trivial
> Labels: newbie
>
> Triggered by a comment in a review request, I noticed that we currently have
> no consistent style for naming include guards.
> Examples:
> include/mesos/resources.hpp: {{#define __RESOURCES_HPP__}}
> include/mesos/executor.hpp: {{#define __MESOS_EXECUTOR_HPP__}}
> include/mesos/mesos.hpp: {{#define __MESOS_HPP__}}
> I think the **right** way would be stating the path and include file name
> within the guard, so the above at fault become:
> include/mesos/resources.hpp: {{#define __MESOS_RESOURCES_HPP__}}
> include/mesos/mesos.hpp: {{#define __MESOS_MESOS_HPP__}}
> Everything from include/XXX should have a __XXX_ prefix in its guard name,
> anything from src/XXX should have a __XXX_ prefix. This should also apply to
> multiple folder levels; e.g. include/XXX/YYY/FOO should have a __XXX_YYY_FOO
> prefix.
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