Re: [Interest] C++11 enum class and QSettings

2016-12-05 Thread Bob Hood 

On 12/5/2016 12:48 AM, Michael Sué wrote:

Hi,

with a enum class you'll need to give the type explicitly, as there is no 
auto-conversion to int:

  settings.setValue("report.stacking", 
QVariant::fromValue(report_stacking));

The same with QVariant::value: var.value();


Thanks, Michael (and everybody else who answered).  Your solution worked 
perfectly with the least amount of changes.

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Re: [Interest] C++11 enum class and QSettings

2016-12-04 Thread Michael Sué 
Hi,

with a enum class you'll need to give the type explicitly, as there is no 
auto-conversion to int:

 settings.setValue("report.stacking", 
QVariant::fromValue(report_stacking));

The same with QVariant::value: var.value();

- Michael.

-Original Message-
From: Interest [mailto:interest-bounces+sue=sf.mpg...@qt-project.org] On Behalf 
Of Bob Hood
Sent: Monday, December 5, 2016 4:16 AM
To: interest@qt-project.org
Subject: [Interest] C++11 enum class and QSettings

I'm trying to save a C++11 enum class value in a QSettings.  In a header I have:

 #include 

 enum class ReportStacking
 {
 Stacked,
 Intermixed
 };
 Q_DECLARE_METATYPE(ReportStacking)

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Re: [Interest] C++11 enum class and QSettings

2016-12-04 Thread Thiago Macieira 
On domingo, 4 de dezembro de 2016 20:15:42 PST Bob Hood wrote:
>  QVariant::save: unable to save type 'ReportStacking' (type id: 1027).

You need to call qRegisterMetaTypeStreamOperators() for your type so that 
QVariant knows how to stream into a QDataStream.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center

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Re: [Interest] C++11 enum class and QSettings

2016-12-04 Thread Ch'Gans 
On 5 December 2016 at 16:15, Bob Hood  wrote:
> I'm trying to save a C++11 enum class value in a QSettings.  In a header I
> have:
>
> #include 
>
> enum class ReportStacking
> {
> Stacked,
> Intermixed
> };
> Q_DECLARE_METATYPE(ReportStacking)
>
> And then in the module, using a data member of this type:
>
> ReportStacking report_stacking = ReportStacking::Intermixed;
>
> I've tried both:
>
> QVariant var;
> var.setValue(report_stacking);
> settings.setValue("report.stacking", var);
>
> and:
>
> settings.setValue("report.stacking",
> QVariant::fromValue(report_stacking));
>
> and I'm getting a run-time error:
>
> QVariant::save: unable to save type 'ReportStacking' (type id: 1027).
>
> ASSERT failure in QVariant::save: "Invalid type to save", file
> kernel\qvariant.cpp, line 2144
> Debug Error!
>
> Program: Q:\Qt\5.6.2\64_dll\bin\Qt5Cored.dll
> Module: 5.6.2
> File: global\qglobal.cpp
> Line: 3026
>
> ASSERT failure in QVariant::save: "Invalid type to save", file
> kernel\qvariant.cpp, line 2144

I might be wrong, but i think that Q_DECLARE_METATYPE doesn't cross
shared object boundary, if the code serialising the enum isn't in the
same shared object that the one that declare it, then you need to call
qRegisterMetaType() from your main object.

Chris


>
> Is there a Qt-base way of storing C++11 enum class types, or do I have to do
> some manual coding to map a ReportStacking class value to an int for
> QSettings to digest?
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[Interest] C++11 enum class and QSettings

2016-12-04 Thread Bob Hood 

I'm trying to save a C++11 enum class value in a QSettings.  In a header I have:

#include 

enum class ReportStacking
{
Stacked,
Intermixed
};
Q_DECLARE_METATYPE(ReportStacking)

And then in the module, using a data member of this type:

ReportStacking report_stacking = ReportStacking::Intermixed;

I've tried both:

QVariant var;
var.setValue(report_stacking);
settings.setValue("report.stacking", var);

and:

settings.setValue("report.stacking", QVariant::fromValue(report_stacking));

and I'm getting a run-time error:

QVariant::save: unable to save type 'ReportStacking' (type id: 1027).

ASSERT failure in QVariant::save: "Invalid type to save", file 
kernel\qvariant.cpp, line 2144

Debug Error!

Program: Q:\Qt\5.6.2\64_dll\bin\Qt5Cored.dll
Module: 5.6.2
File: global\qglobal.cpp
Line: 3026

ASSERT failure in QVariant::save: "Invalid type to save", file 
kernel\qvariant.cpp, line 2144


Is there a Qt-base way of storing C++11 enum class types, or do I have to do 
some manual coding to map a ReportStacking class value to an int for QSettings 
to digest?

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