QMetaSequence::Iterable Class

Detailed Description

This class allows several methods of accessing the values of a container held within a QVariant. An instance of QMetaSequence::Iterable can be extracted from a QVariant if it can be converted to a QVariantList, or if the container it contains is registered using Q_DECLARE_SEQUENTIAL_CONTAINER_METATYPE. Most sequential containers found in Qt and some found in the C++ standard library are automatically registered.

 QList<int> intList = {7, 11, 42};

 QVariant variant = QVariant::fromValue(intList);
 if (variant.canConvert<QVariantList>()) {
     QMetaSequence::Iterable iterable = variant.value<QMetaSequence::Iterable>();
     // Can use C++11 range-for:
     for (const QVariant &v : iterable) {
         qDebug() << v;
     }
     // Can use iterators:
     QMetaSequence::Iterable::const_iterator it = iterable.begin();
     const QMetaSequence::Iterable::const_iterator end = iterable.end();
     for ( ; it != end; ++it) {
         qDebug() << *it;
     }
 }

The container itself is not copied before iterating over it.