typedefs and Q_REGISTER_METATYPE

[hickscorp]

Hello,

i'm working on a large project and i would like to be able to do as follows:

typedef qreal Ratio;
typedef qreal PositiveRatio;
typedef qreal NegativeRatio;
Q_DECLARE_METATYPE(Ratio);
Q_DECLARE_METATYPE(PositiveRatio);
Q_DECLARE_METATYPE(NegativeRatio);

typedef qreal Ratio;
typedef qreal PositiveRatio;
typedef qreal NegativeRatio;
Q_DECLARE_METATYPE(Ratio);
Q_DECLARE_METATYPE(PositiveRatio);
Q_DECLARE_METATYPE(NegativeRatio);

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However, the compiler doesn't like it, and only accepts to register the first one.

My question is, how can i register metatypes based on the same underlying type as different types? What would be the trick if any?

Thanks,
Pierre.

[edit:] The goal is to provide different edition widgets, like that, in my editors factory:

/* ... */
else if (t==qMetaTypeId<Ratio>() || t==qMetaTypeId<PositiveRatio>() || t==qMetaTypeId<NegativeRatio>()) {
	QDoubleSpinBox	*spnBx	= new QDoubleSpinBox(p);
	spnBx->setRange(t==qMetaTypeId<PositiveRatio>() ? 0.0 : -1.0, t==qMetaTypeId<NegativeRatio>() ? 0.0 : 1.0);
	spnBx->setSingleStep	(.05);
	return spnBx;
}
/* ... */

/* ... */
else if (t==qMetaTypeId<Ratio>() || t==qMetaTypeId<PositiveRatio>() || t==qMetaTypeId<NegativeRatio>()) {
	QDoubleSpinBox	*spnBx	= new QDoubleSpinBox(p);
	spnBx->setRange(t==qMetaTypeId<PositiveRatio>() ? 0.0 : -1.0, t==qMetaTypeId<NegativeRatio>() ? 0.0 : 1.0);
	spnBx->setSingleStep	(.05);
	return spnBx;
}
/* ... */

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[/edit]

[hickscorp]

For those interested, i have found a good solution to this problem. It will be soon online because i have posted it to qt-interest mailing list.