Enums to QVariants and comparing those after the conversion.

[hickscorp]

Where is defined QVariant::data?

In the QVariant exposed C++ API. However its a public method defined from the exposed header of QVariant. It allows me to construct a QVariant by giving it a pointer of my value which is internally copied. That's the only way i have to construct a QVariant which type will be my usertype.
[EDIT]You were right MarekR22, i made a typo when posting my snippets... the code should have read:

itemData(i)==v

itemData(i)==v

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My bad![/EDIT]

I don't see it in documentation!

Aren't the public methods exposed in a header file the best documentation for a class?

I understand that you are assuming that nums are not flag kind (QMetaEnum::isFlag)!
Every enum can be treated as int value! So you should compare enums as ints:
[CODE]bool ok = false;
if (itemData(i).toInt() ==v.toInt(&ok))

The conversion isnt working. QVariant::toInt when storing enum values always return 0. i have no idea why. It seems that when constructing a QVariant from a usertype, i won't be able to convert them later.

Why did you chose QVariant::Type as constructor parameter?

As i said: That's the only way my QVariant will then carry the right type...

Why not QVariant, enum name (const char *) or QMetaEnum?

Your first suggestion constructs a QVariant based on QString, the problem is that the typing information is lost when doing that. Your second suggestion is a no-do. QMetaEnum is not actually carying the value of the enum, just its typing information...


To summarize what i need: QVariant can carry both the typing and the value of things... i need to use both, i.e. to be able to first look at QVariant types (To know if they are storing enum values from the same enum), and them compare them.

Any other idea please? An actual working sample code would greatly help...
Pierre.

[mentalmushroom]

Not sure I understand correctly what you need, but take a look at these functions:

Type QVariant::type () const
int QVariant::userType () const
const char * QVariant::typeName () const
const char * QVariant::typeToName ( Type typ ) [static]

Type QVariant::type () const
int QVariant::userType () const
const char * QVariant::typeName () const
const char * QVariant::typeToName ( Type typ ) [static]

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[nightghost]

...
for (quint32 i=0; i<cEnum; i++) {
const char *key = en.key(i);
uint const val = en.value(i);
QVariant const var (t, &val);
addItem (classNameToNaturalString(key), var);
qDebug() << var;
...
}

...
for (quint32 i=0; i<cEnum; i++) {
const char *key = en.key(i);
uint const val = en.value(i);
QVariant const var (t, &val);
addItem (classNameToNaturalString(key), var);
qDebug() << var;
...
}

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the address to the uint gets invalid after the foreach block.