> -----Original Message----- > From: Development <development-boun...@qt-project.org> On Behalf Of > Volker Hilsheimer via Development > Sent: Monday, 10 October 2022 5:55 PM > To: development@qt-project.org > Subject: [Development] Using '#pragma once' instead of include guards? > > Hi, > > > We are using `#pragma once` in a number of examples and tests in the Qt > source tree, but I don’t think we have officially endorsed it in favour of > explicit include guards. > > #pragma once is “non-standard but widely supported” [1], with some > caveats, e.g. when there are multiple header files with the same name > (which each compiler then handles differently, as there is no standard). > > From what I see, it should in practice be ok to use. But perhaps I’m missing > something. Does anything speak against using ‘#pragma once’ in new files?
FYI, there was a discussion about this a few years back: https://lists.qt-project.org/pipermail/development/2018-October/033726.html > > Volker > > [1] https://en.wikipedia.org/wiki/Pragma_once > > _______________________________________________ > Development mailing list > Development@qt-project.org > https://lists.qt-project.org/listinfo/development _______________________________________________ Development mailing list Development@qt-project.org https://lists.qt-project.org/listinfo/development
