QSequentialIterable Class▲
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Header: QSequentialIterable
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Since: Qt 5.2
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qmake: QT += core
Detailed Description▲
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.
See Also▲
See also QVariant
Member Function Documentation▲
QVariant QSequentialIterable::at(int idx) const▲
Returns the element at position idx in the container.
QSequentialIterable::const_iterator QSequentialIterable::begin() const▲
Returns a QSequentialIterable::const_iterator for the beginning of the container. This can be used in stl-style iteration.
See Also▲
See also end()
bool QSequentialIterable::canReverseIterate() const▲
Returns whether it is possible to iterate over the container in reverse. This corresponds to the std::bidirectional_iterator_tag iterator trait of the const_iterator of the container.
QSequentialIterable::const_iterator QSequentialIterable::end() const▲
Returns a QSequentialIterable::const_iterator for the end of the container. This can be used in stl-style iteration.
See Also▲
See also begin()
int QSequentialIterable::size() const▲
Returns the number of elements in the container.