QVariant::ConstReference Class
template <typename Indirect> class QVariant::ConstReferenceThe QVariant::ConstReference acts as a const reference to a QVariant. More...
This class was introduced in Qt 6.11.
Public Functions
| ConstReference(Indirect &&referred) | |
| ConstReference(QVariant::Reference<Indirect> &&nonConst) | |
| ConstReference(const Indirect &referred) | |
| ConstReference(const QVariant::Reference<Indirect> &nonConst) | |
| operator QVariant() const |
Detailed Description
As the generic iterators don't actually instantiate a QVariant on each step, they cannot return a reference to one from operator*(). QVariant::ConstReference provides the same functionality as an actual reference to a QVariant would, but is backed a referred-to value given as template parameter. The template is implemented for QMetaSequence::ConstIterator, QMetaSequence::Iterator, QMetaAssociation::ConstIterator, and QMetaAssociation::Iterator.
Member Function Documentation
[explicit noexcept(...)] ConstReference::ConstReference(Indirect &&referred)
Creates a QVariant::ConstReference from a referred.
Note: This function is noexcept when std::is_nothrow_move_constructible_v<Indirect> is true.
[default] ConstReference::ConstReference(QVariant::Reference<Indirect> &&nonConst)
Creates a QVariant::ConstReference from a nonConst Reference.
[explicit noexcept(...)] ConstReference::ConstReference(const Indirect &referred)
Creates a QVariant::ConstReference from a referred.
Note: This function is noexcept when std::is_nothrow_copy_constructible_v<Indirect> is true.
[noexcept(...)] ConstReference::ConstReference(const QVariant::Reference<Indirect> &nonConst)
Creates a QVariant::ConstReference from a nonConst Reference.
Note: This function is noexcept when std::is_nothrow_copy_constructible_v<Indirect> is true.
[noexcept(...)] ConstReference::operator QVariant() const
Dereferences the reference to a QVariant. This method needs to be specialized for each Indirect type. It is pre-defined for QMetaSequence::ConstIterator, QMetaSequence::Iterator, QMetaAssociation::ConstIterator, and QMetaAssociation::Iterator.
Note: This function is noexcept when Indirect::CanNoexceptConvertToQVariant is true.