QSequentialIterable Class▲
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Header: QSequentialIterable
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Since: Qt 5.2
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CMake:
find_package(Qt6 REQUIRED COMPONENTS Core)
target_link_libraries(mytarget PRIVATE Qt6::Core)
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qmake: QT += core
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Inherits: QIterable
Detailed Description▲
This class allows several methods of accessing the values 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 Type Documentation▲
[alias] QSequentialIterable::BidirectionalConstIterator▲
Exposes a const_iterator using std::bidirectional_iterator_tag.
[alias] QSequentialIterable::BidirectionalIterator▲
Exposes an iterator using std::bidirectional_iterator_tag.
[alias] QSequentialIterable::ForwardConstIterator▲
Exposes a const_iterator using std::forward_iterator_tag.
[alias] QSequentialIterable::ForwardIterator▲
Exposes an iterator using std::forward_iterator_tag.
[alias] QSequentialIterable::InputConstIterator▲
Exposes a const_iterator using std::input_iterator_tag.
[alias] QSequentialIterable::InputIterator▲
Exposes an iterator using std::input_iterator_tag.
[alias] QSequentialIterable::RandomAccessConstIterator▲
Exposes a const_iterator using std::random_access_iterator_tag.
[alias] QSequentialIterable::RandomAccessIterator▲
Exposes an iterator using std::random_access_iterator_tag.
[alias] QSequentialIterable::const_iterator▲
The QSequentialIterable::const_iterator allows iteration over a container in a QVariant.
A QSequentialIterable::const_iterator can only be created by a QSequentialIterable instance, and can be used in a way similar to other stl-style iterators.
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;
}
}[alias, since 6.0] QSequentialIterable::iterator▲
The QSequentialIterable::iterator allows iteration over a container in a QVariant.
A QSequentialIterable::iterator can only be created by a QSequentialIterable instance, and can be used in a way similar to other stl-style iterators.
This typedef was introduced in Qt 6.0.
Member Function Documentation▲
void QSequentialIterable::addValue(const QVariant &value, QSequentialIterable::Position position = Unspecified)▲
Adds value to the container, at position, if possible.
QVariant QSequentialIterable::at(qsizetype idx) const▲
Returns the value at position idx in the container.
void QSequentialIterable::removeValue(QSequentialIterable::Position position = Unspecified)▲
Removes a value from the container, at position, if possible.
void QSequentialIterable::set(qsizetype idx, const QVariant &value)▲
Sets the element at position idx in the container to value.