it's sure that lot of people will wait for a release version of 5.0, or 5.1, if there is no way to use the same source code with #ifdef ... Providing the way to test Qt5 before, will allow more feedback from users ... and a stronger release ! just my two cents !
Le 21/02/2012 17:55, henry.haveri...@nokia.com a écrit : > On 2/20/12 10:47 AM, "ext Thiago Macieira"<thi...@kde.org> wrote: > >>>> It's also possible to have different .qml files having slightly >>> different >>>> imports. You just can't mix major versions, because the backend >>> library is >>>> completely different. >>> I would also assume that it's necessary to have separate files for each >>> supported version. I can only speculate on how many there would be, but >>> my guess would be not too many. So it might not be a problem. If there >>> are a lot of them, it would become a maintainance nightmare. >> Indeed, separate files. The point is that you should not have to keep >> many >> files. Once you're ready to upgrade (and require a new version), you do >> it and >> don't look back. You don't keep two versions working. > Another common case for #ifdefs is configuration management in > cross-platform projects. > It's not always possible to port a project to a new platform and never > look back. :-) > > In one of our Qt SDK user surveys, we asked how much people use non-Qt > APIs in their projects. > Only around 20-25% of projects were 100% Qt code, varying a bit between > target platforms. > Here are the results for one random platform, Mac OS X (N = 287): > > My application is 100% Qt Code: 20.6 % > > Small part of my application uses non-Qt APIs: 54.0 % > > Significant part of my application uses non-Qt APIs: 17.1 % > I use Qt for a small part of my application only: 3.8 % > > > I know this data doesn't prove that #ifdefs are required, because maybe > some of the non-Qt APIs might be cross-platform, and maybe some of the > code that calls non-Qt non-cross-platform APIs can be separated out in > platform-specific source files. Anyways, cross-platform Qt C++ projects > often benefit from being able to have #ifdefs around some short snippets > inside a file. > > I would expect some sort of conditional evaluation statement would be > useful in cross-platform Qt Quick projects too. > > Cheers, > Henry > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
