QVariant::Reference Class | Qt Core | Qt 6.10.3
Description: The QVariant::Reference acts as a non-const reference to a QVariant.

- Qt 6.10
- Qt Core
- C++ Classes
- Reference
- Qt 6.10.3 Reference Documentation

# QVariant::Reference Class

template <typename Referred> class QVariant::Reference

The QVariant::Reference acts as a non-const reference to a QVariant. More...

This class was introduced in Qt 6.11.

- List of all members, including inherited members

## Public Functions

| Reference(Referred &&referred)
| Reference(const Referred &referred)
QVariant | operator QVariant() const
QVariant::Reference<Referred> & | operator=(QVariant::Reference<Referred> &&value)
QVariant::Reference<Referred> & | operator=(const QVariant &value)
QVariant::Reference<Referred> & | operator=(const QVariant::Reference<Referred> &value)

## 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::Reference 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::Iterator and QMetaAssociation::Iterator.

## Member Function Documentation

### `[explicit noexcept(...)]` Reference::Reference(Referred &&referred)

Creates a QVariant::Reference from a referred.

Note: This function is noexcept when `std::is_nothrow_move_constructible_v<Referred>` is `true`.

### `[explicit noexcept(...)]` Reference::Reference(const Referred &referred)

Creates a QVariant::Reference from a referred.

Note: This function is noexcept when `std::is_nothrow_copy_constructible_v<Referred>` is `true`.

### `[noexcept(...)]` QVariant Reference::operator QVariant() const

Dereferences the reference to a QVariant. By default this instantiates a temporary QVariant::ConstReference and calls dereferences that. In cases where instantiating a temporary ConstReference is expensive, this method should be specialized.

Note: This function is noexcept when `Referred::canNoexceptConvertToQVariant` is `true`.

### `[noexcept(...)]` QVariant::Reference<Referred> &Reference::operator=(QVariant::Reference<Referred> &&value)

Assigns a new value to the value referred to by this QVariant::Reference.

Note: This function is noexcept when `Referred::canNoexceptAssignQVariant` is `true`.

### `[noexcept(...)]` QVariant::Reference<Referred> &Reference::operator=(const QVariant &value)

Assigns a new value to the value referred to by this QVariant::Reference. This method needs to be specialized for each Referred type. It is pre-defined for QMetaSequence::Iterator and QMetaAssociation::Iterator.

Note: This function is noexcept when `Referred::canNoexceptAssignQVariant` is `true`.

### `[noexcept(...)]` QVariant::Reference<Referred> &Reference::operator=(const QVariant::Reference<Referred> &value)

Assigns a new value to the value referred to by this QVariant::Reference.

Note: This function is noexcept when `Referred::canNoexceptAssignQVariant` is `true`.