Iterable Class Reference

\inherits QIterable More...

Collaboration diagram for Iterable:

Detailed Description

\inherits QIterable

Since

6.11 \inmodule QtCore

QMetaAssociation::Iterable is an iterable interface for an associative container in a QVariant.

This class allows several methods of accessing the elements of an associative container held within a QVariant. An instance of QMetaAssociation::Iterable can be extracted from a QVariant if it can be converted to a QVariantHash or QVariantMap or if a custom mutable view has been registered.

        QHash<int, QString> mapping;
        mapping.insert(7, "Seven");
        mapping.insert(11, "Eleven");
        mapping.insert(42, "Forty-two");
 
        QVariant variant = QVariant::fromValue(mapping);
        if (variant.canConvert<QVariantHash>()) {
            QMetaAssociation::Iterable iterable = variant.value<QMetaAssociation::Iterable>();
            // Can use C++11 range-for over the values:
            for (const QVariant &v : iterable) {
                qDebug() << v;
            }
            // Can use iterators:
            QMetaAssociation::Iterable::const_iterator it = iterable.begin();
            const QMetaAssociation::Iterable::const_iterator end = iterable.end();
            for ( ; it != end; ++it) {
                qDebug() << *it; // The current value
                qDebug() << it.key();
                qDebug() << it.value();
            }
        }

The container itself is not copied before iterating over it.

See also

QVariant

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

• qtbase/src/corelib/kernel/qmetaassociation.cpp (bd04c5d7a4b907b8c4a2d2dda4ba3f24f687fb7f)