[Interest] can't dump QStringList with qDebug()

[Dmitriy Purgin]

Hi,

I'm sure you have already tried it, but just a wild guess: do you have
#include <QStringList> in this .cpp file?

Cheers
Dmitriy

On Tue, Mar 7, 2023 at 11:04 AM Hamish Moffatt via Interest <
interest at qt-project.org> wrote:

> On 7/3/23 20:11, Kai Köhne wrote:
> > Hi,
> >
> > This looks like a compiler issue to me.
> >>      const auto connections = QSqlDatabase::connectionNames();
> >>      qDebug() << "Closing open connections:" << connections;
> >>
> >> claiming that
> >> ../../../src/server/server_database.cpp:691:45: error: invalid operands
> to binary expression ('QDebug' and>
> >> 'const QList<QString>')
> > I think this is the place where it goes wrong:
> >
> >> ../../../../Qt6.4.2/6.4.2/gcc_64/include/QtCore/qdebug.h:217:53: note:
> candidate template ignored: requirement
> 'std::conjunction_v<std::disjunction<std::is_base_of<QList<QString>,
> QString>, QTypeTraits::has_ostream_operator<QDebug, QString, void>>>' was
> not satisfied [with T = QString]
> >> inline QDebugIfHasDebugStreamContainer<QList<T>, T> operator<<(QDebug
> debug, const QList<T> &vec)
> >>                                                      ^
> > Anyhow, I couldn't reproduce this in a minimal example (and apparently
> you didn't manage either?). At minimum we need the exact compiler +
> compiler options passed on command line.
>
>
> It's happening in both Visual C++ and gcc 10, but on further
> investigation, only in one .cpp file; the same code in other files works
> fine. I'll keep investigating.
>
>
> thanks
>
> Hamish
>
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