QSequentialIterable Class

Detailed Description

The QSequentialIterable class is an iterable interface for a container in a QVariant.

This class allows several methods of accessing the elements of a container held within a QVariant. An instance of QSequentialIterable can be extracted from a QVariant if it can be converted to a QVariantList.

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

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

The container itself is not copied before iterating over it.