我应该尽可能多地使用#ifndef Q_MOC_RUN 吗？
Should I use #ifndef Q_MOC_RUN as much a possible?
我有一个使用 Boost 库的 Qt/C++ 项目，我看到 Boost headers 是这样包含的：
#ifndef Q_MOC_RUN
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/date_time/gregorian/gregorian.hpp>
#endif
我了解到，如果您不这样做，MOC 可能会导致问题。
问题是，我难道不应该使用这个守卫来包含所有其他绝对不包含 Q_OBJECT marco 的 headers 吗？例如标准库 headers 和其他 non-Qt 库？ MOC预处理器运行时不是可以节省很多时间吗？
来自主题Qt5 moc error in combination with boost：
First, this is a known MOC issue. The MOC can't expand some of the
macros used in the Boost library. I believe the reason Qt 4.8 works is
that a workaround for specific Boost macro definitions was added to
the MOC configuration for that version.
What you need to do to work around this issue: As stated above, use
Q_MOC_RUN to comment out problematic headers. You ONLY need to use
Q_MOC_RUN in files that produce a moc file (e.g. myheader.h will
produce moc_myheader.cpp). You can limit the hack to just those files.
So you don't need to #ifndef all usages of Boost headers in your
project which limits the pain of implementing this solution quite a
bit.
看来这个问题很久以前就解决了，所以如果你没有任何问题并且不需要支持旧版本的Qt，你可能不会在你以后的代码中添加这个宏。
我有一个使用 Boost 库的 Qt/C++ 项目，我看到 Boost headers 是这样包含的：
#ifndef Q_MOC_RUN
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/date_time/gregorian/gregorian.hpp>
#endif
我了解到，如果您不这样做，MOC 可能会导致问题。
问题是，我难道不应该使用这个守卫来包含所有其他绝对不包含 Q_OBJECT marco 的 headers 吗？例如标准库 headers 和其他 non-Qt 库？ MOC预处理器运行时不是可以节省很多时间吗？
来自主题Qt5 moc error in combination with boost：
First, this is a known MOC issue. The MOC can't expand some of the macros used in the Boost library. I believe the reason Qt 4.8 works is that a workaround for specific Boost macro definitions was added to the MOC configuration for that version.
What you need to do to work around this issue: As stated above, use Q_MOC_RUN to comment out problematic headers. You ONLY need to use Q_MOC_RUN in files that produce a moc file (e.g. myheader.h will produce moc_myheader.cpp). You can limit the hack to just those files. So you don't need to #ifndef all usages of Boost headers in your project which limits the pain of implementing this solution quite a bit.
看来这个问题很久以前就解决了，所以如果你没有任何问题并且不需要支持旧版本的Qt，你可能不会在你以后的代码中添加这个宏。