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ConstReference Class

template <typename Referred> class QVariant::ConstReference

QVariant::ConstReference 充当QVariant 的常量引用 ... 更多...

该类在 Qt 6.11 中引入。

公共函数

ConstReference(Referred &&referred)
ConstReference(const Referred &referred)
QVariant operator QVariant() const

详细说明

由于泛型迭代器并不在每一步都实例化一个QVariant ,因此它们无法从 operator*() 返回一个引用。QVariant::ConstReference 提供的功能与实际引用QVariant 的功能相同,但作为模板参数返回一个引用值。该模板是为 QMetaSequence::ConstIterator、QMetaSequence::Iterator、QMetaAssociation::ConstIterator 和 QMetaAssociation::Iterator 实现的。

成员函数文档

[explicit noexcept(...)] ConstReference::ConstReference(Referred &&referred)

referred 创建QVariant::ConstReference

注: std::is_nothrow_move_constructible_v<Referred>true 时,此函数为 noexcept。

[explicit noexcept(...)] ConstReference::ConstReference(const Referred &referred)

referred 创建QVariant::ConstReference

注: std::is_nothrow_copy_constructible_v<Referred>true 时,此函数为 noexcept。

[noexcept(...)] QVariant ConstReference::operator QVariant() const

取消对QVariant 的引用。此方法需要为每种引用类型专门设计。它为 QMetaSequence::ConstIterator、QMetaSequence::Iterator、QMetaAssociation::ConstIterator 和 QMetaAssociation::Iterator 预先定义。

注意: Referred::canNoexceptConvertToQVarianttrue 时,此函数为 noexcept。

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