1 files changed, 173 insertions, 0 deletions
diff --git a/src/corelib/kernel/qassociativeiterable.h b/src/corelib/kernel/qassociativeiterable.h
new file mode 100644
index 0000000000..f3963d350e
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+++ b/src/corelib/kernel/qassociativeiterable.h
@@ -0,0 +1,173 @@
+// Copyright (C) 2020 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QASSOCIATIVEITERABLE_H
+#define QASSOCIATIVEITERABLE_H
+
+#include <QtCore/qiterable.h>
+#include <QtCore/qvariant.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_CORE_EXPORT QAssociativeIterator : public QIterator<QMetaAssociation>
+{
+public:
+    using key_type = QVariant;
+    using mapped_type = QVariant;
+    using reference = QVariantRef<QAssociativeIterator>;
+    using pointer = QVariantPointer<QAssociativeIterator>;
+
+    QAssociativeIterator(QIterator &&it)
+        : QIterator(std::move(it))
+    {}
+
+    QVariant key() const;
+    QVariantRef<QAssociativeIterator> value() const;
+
+    QVariantRef<QAssociativeIterator> operator*() const;
+    QVariantPointer<QAssociativeIterator> operator->() const;
+};
+
+class Q_CORE_EXPORT QAssociativeConstIterator : public QConstIterator<QMetaAssociation>
+{
+public:
+    using key_type = QVariant;
+    using mapped_type = QVariant;
+    using reference = const QVariant &;
+    using pointer = QVariantConstPointer;
+
+    QAssociativeConstIterator(QConstIterator &&it)
+        : QConstIterator(std::move(it))
+    {}
+
+    QVariant key() const;
+    QVariant value() const;
+
+    QVariant operator*() const;
+    QVariantConstPointer operator->() const;
+};
+
+class Q_CORE_EXPORT QAssociativeIterable : public QIterable<QMetaAssociation>
+{
+public:
+    using iterator = QTaggedIterator<QAssociativeIterator, void>;
+    using const_iterator = QTaggedIterator<QAssociativeConstIterator, void>;
+
+    using RandomAccessIterator = QTaggedIterator<iterator, std::random_access_iterator_tag>;
+    using BidirectionalIterator = QTaggedIterator<iterator, std::bidirectional_iterator_tag>;
+    using ForwardIterator = QTaggedIterator<iterator, std::forward_iterator_tag>;
+    using InputIterator = QTaggedIterator<iterator, std::input_iterator_tag>;
+
+    using RandomAccessConstIterator = QTaggedIterator<const_iterator, std::random_access_iterator_tag>;
+    using BidirectionalConstIterator = QTaggedIterator<const_iterator, std::bidirectional_iterator_tag>;
+    using ForwardConstIterator = QTaggedIterator<const_iterator, std::forward_iterator_tag>;
+    using InputConstIterator = QTaggedIterator<const_iterator, std::input_iterator_tag>;
+
+    template<class T>
+    QAssociativeIterable(const T *p)
+        : QIterable(QMetaAssociation::fromContainer<T>(), p)
+    {
+    }
+
+    template<class T>
+    QAssociativeIterable(T *p)
+        : QIterable(QMetaAssociation::fromContainer<T>(), p)
+    {
+    }
+
+    QAssociativeIterable()
+        : QIterable(QMetaAssociation(), nullptr)
+    {
+    }
+
+    template<typename Pointer>
+    QAssociativeIterable(const QMetaAssociation &metaAssociation, Pointer iterable)
+        : QIterable(metaAssociation, iterable)
+    {
+    }
+
+    // ### Qt7: Pass QMetaType as value rather than const ref.
+    QAssociativeIterable(const QMetaAssociation &metaAssociation, const QMetaType &metaType,
+                         void *iterable)
+        : QIterable(metaAssociation, metaType.alignOf(), iterable)
+    {
+    }
+
+    // ### Qt7: Pass QMetaType as value rather than const ref.
+    QAssociativeIterable(const QMetaAssociation &metaAssociation, const QMetaType &metaType,
+                         const void *iterable)
+        : QIterable(metaAssociation, metaType.alignOf(), iterable)
+    {
+    }
+
+    QAssociativeIterable(QIterable<QMetaAssociation> &&other) : QIterable(std::move(other)) {}
+
+    QAssociativeIterable &operator=(QIterable<QMetaAssociation> &&other)
+    {
+        QIterable::operator=(std::move(other));
+        return *this;
+    }
+
+    const_iterator begin() const { return constBegin(); }
+    const_iterator end() const { return constEnd(); }
+
+    const_iterator constBegin() const { return const_iterator(QIterable::constBegin()); }
+    const_iterator constEnd() const { return const_iterator(QIterable::constEnd()); }
+
+    iterator mutableBegin() { return iterator(QIterable::mutableBegin()); }
+    iterator mutableEnd() { return iterator(QIterable::mutableEnd()); }
+
+    const_iterator find(const QVariant &key) const;
+    const_iterator constFind(const QVariant &key) const { return find(key); }
+    iterator mutableFind(const QVariant &key);
+
+    bool containsKey(const QVariant &key);
+    void insertKey(const QVariant &key);
+    void removeKey(const QVariant &key);
+
+    QVariant value(const QVariant &key) const;
+    void setValue(const QVariant &key, const QVariant &mapped);
+};
+
+template<>
+inline QVariantRef<QAssociativeIterator>::operator QVariant() const
+{
+    if (m_pointer == nullptr)
+        return QVariant();
+
+    const auto metaAssociation = m_pointer->metaContainer();
+    const QMetaType metaType(metaAssociation.mappedMetaType());
+    if (!metaType.isValid())
+        return m_pointer->key();
+
+    QVariant v(metaType);
+    metaAssociation.mappedAtIterator(m_pointer->constIterator(),
+                                     metaType == QMetaType::fromType<QVariant>() ? &v : v.data());
+    return v;
+}
+
+template<>
+inline QVariantRef<QAssociativeIterator> &QVariantRef<QAssociativeIterator>::operator=(
+        const QVariant &value)
+{
+    if (m_pointer == nullptr)
+        return *this;
+
+    const auto metaAssociation = m_pointer->metaContainer();
+    const QMetaType metaType(metaAssociation.mappedMetaType());
+    if (metaType.isValid()) {
+        QtPrivate::QVariantTypeCoercer coercer;
+        metaAssociation.setMappedAtIterator(m_pointer->constIterator(),
+                                            coercer.coerce(value, metaType));
+    }
+
+    return *this;
+}
+
+Q_DECLARE_TYPEINFO(QAssociativeIterable, Q_RELOCATABLE_TYPE);
+Q_DECLARE_TYPEINFO(QAssociativeIterable::iterator, Q_RELOCATABLE_TYPE);
+Q_DECLARE_TYPEINFO(QAssociativeIterable::const_iterator, Q_RELOCATABLE_TYPE);
+
+QT_END_NAMESPACE
+
+#endif // QASSOCIATIVEITERABLE_H