QMetaAssociation::Iterable::ConstIterator Class | Qt Core | Qt 6.11.2
Description: QMetaAssociation::Iterable::ConstIterator allows iteration over a container in a QVariant.

- Qt 6.11
- Qt Core
- C++ Classes
- ConstIterator
- Qt 6.11.2 Reference Documentation

# 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.