Does anyone know why big int values on QVariant store as double ?

mbnoimi

I'm not sure what do you mean but QVariant works fine with maximum value of int

@#include <QCoreApplication>
#include <QDebug>
#include <limits>

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

int x = INT_MAX;
qDebug() << QVariant(x).toInt();

return a.exec&#40;&#41;;

}
@

You can past a snippet in case that's not what you mean.

aabc

Try to use it this way:

@
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

int x = INT_MAX;
QVariant v1 = x;
qDebug() << v1;

return a.exec&#40;&#41;;

}

@

raven-worx

this outputs the following in the console for me:
[quote]QVariant(int, 2147483647)[/quote]

Which compiler are you using?

mbnoimi

[quote author="aabc" date="1367143234"]Try to use it this way:[/quote]

It works fine to me!!! I got this:

bq. QVariant(int, 2147483647)

aabc

It happens when I use it with QML (Created C++ QML object)

raven-worx

[quote author="aabc" date="1367143234"]Try to use it this way:

@
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

int x = INT_MAX;
QVariant v1 = x;
qDebug() << v1;

return a.exec&#40;&#41;;

}
@
[/quote]

well..whats your output of these lines?!

aabc

The same as yours.
This problem happens when I use it with QML.
For some reason if I pass large int to variant property (C++ QVariant) it stores it as double

amccarthy

QML/JavaScript only has a single number type, implemented as a double. Assigning directly to a QVariant property will keep this type information. Is this what you are seeing?

raven-worx

show the code please.

aabc

Not exactly.
Whan I assign to QML int property small value (such as 500) the C++ QVariant stores it as int.
But when I assign to this QML int property large value (such as 1111111111) the C++ QVariant stores it as double.

aabc

C++:

@
class MyItem: public QObject
{
Q_OBJECT

Q_PROPERTY(QVariant value       READ value          WRITE setValue  NOTIFY valueChanged)

public:
inline const QVariant& value() const
{
return m_value;
}

inline void setValue(const QVariant& _value)
{
    qDebug() << "_value = " << _value;
    qDebug() << "m_value = " << m_value;

    if(_value != m_value)
    {
        m_value = _value;
        emit valueChanged();
    }
}

private:
QVariant m_value;
}
@

QML:

@
property int myQmlInt: 111111111

MyItem
{
id: myItem1
value: myQmlInt
}
@