QMetaAssociation::Iterable::ConstIterator Class

class QMetaAssociation::Iterable::ConstIterator

QMetaAssociation::Iterable::ConstIterator allows iteration over a container in a QVariant. More...

This class was introduced in Qt 6.11.

List of all members, including inherited members

Public Functions

QVariant	key() const
QVariant	value() const
QVariant	operator*() const
int	operator->() const

Detailed Description

A QMetaAssociation::Iterable::ConstIterator can only be created by a QMetaAssociation::Iterable instance, and can be used in a way similar to other stl-style iterators.

 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();
     }
 }

See also QMetaAssociation::Iterable.

Member Function Documentation

QVariant ConstIterator::key() const

Returns the key this iterator points to.

QVariant ConstIterator::value() const

Returns the mapped value this iterator points to, or an invalid QVariant if there is no mapped value.

QVariant ConstIterator::operator*() const

Returns the current item, converted to a QVariant. The returned value is the mapped value at the current iterator if there is one, or otherwise the key.

int ConstIterator::operator->() const

Returns the current item, converted to a QVariant::ConstPointer. The QVariant::ConstPointer will resolve to the mapped value at the current iterator if there is one, or otherwise the key.

Contents