Collaboration diagram for Iterable:

Detailed Description

Since: 6.11 \inmodule QtCore

The QMetaSequence::Iterable class is an iterable interface for a container in a QVariant.

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.

See also: QVariant

The documentation for this class was generated from the following file:

qtbase/src/corelib/kernel/qmetasequence.cpp (be9f4be36837849bb4f0a2960b0d3de0933c3f7d)