TRObject - QVariant-based property tree

TRObject.cpp

#include "TRObject.h"

TRObject& TRObject::operator[](const QString& key)
{
	if (type() == QVariant::Map)
		return keyValue<QVariantMap>(this, key);
	else if (type() == QVariant::Hash)
		return keyValue<QVariantHash>(this, key);

	setValue(QVariantMap());

	return keyValue<QVariantMap>(this, key);
}

TRObject& TRObject::operator[](const QString& key) const
{
	return const_cast<TRObject*>(this)->operator[](key);
}

TRObject& TRObject::operator=(const QVariant& value)
{
	setValue(value);
	return *this;
}

TRObject.h

class TRObject : public QVariant
{
public:
	TRObject() : QVariant() {}
	TRObject(const TRObject& o) : QVariant(o) {}
	TRObject(const QVariant& v) : QVariant(v) {}

	TRObject& operator[](const QString& key);
	TRObject& operator[](const QString& key) const;
	TRObject& operator=(const QVariant& value);

private:
	template<typename T>
	TRObject& keyValue(TRObject *ptr, const QString& key) {
		T* p = (T*)ptr->data();
		if (!p->contains(key)) p->insert(key, QVariant());
		return *reinterpret_cast<TRObject *>(&p->operator[](key));
	}
};