void Variant::xmlWrite(QDomDocument& doc, QDomNode& node) const
{
QDomElement elem = createEmptyElement(doc, typeName(type()));
if (isBuiltIn())
VariantBase::xmlWrite(doc, elem);
else
variantData()->xmlWrite(doc, elem);
}
int main(int, char *[])
{
Data data;
data.setString("Hello World");
data.setValue(42);
QTemporaryFile file;
if (!file.open()) {
qDebug() << "Temp file opening failed.";
return EXIT_FAILURE;
}
QDataStream stream(&file);
// If a custom type is searilzed using QVariant,
// serialization operators need to be provided
#ifdef USE_VARIANT
qRegisterMetaTypeStreamOperators<Data>("Data");
QVariant variantData(QVariant::fromValue(data));
stream << variantData;
#else
stream << data;
#endif
file.reset();
// Serialize from the file
Data dataFromFile;
#ifdef USE_VARIANT
QVariant variantFromFile;
stream >> variantFromFile;
dataFromFile.setString(variantFromFile.value<Data>().string());
dataFromFile.setValue(variantFromFile.value<Data>().value());
#else
stream >> dataFromFile;
#endif
qDebug() << dataFromFile.string();
qDebug() << dataFromFile.value();
file.close();
return EXIT_SUCCESS;
}
Variant::operator QString() const
{
if (is(nString))
return *static_cast<const VString*>(variantData());
return QString();
}
Variant::operator double() const
{
if (is(nLongReal))
return *static_cast<const LongReal*>(variantData());
return 0;
}
Variant::operator cfloatnum() const
{
if (is(nLongReal))
return *static_cast<const LongReal*>(variantData());
return LongReal::NaN();
}
void Variant::teardown()
{
if (!isBuiltIn())
variantData()->release();
}
VariantType Variant::type() const
{
if (isBuiltIn())
return VariantBase::type();
return variantData()->type();
}
