1 files changed, 134 insertions, 0 deletions
diff --git a/src/quicktemplates/qquickdeferredpointer_p_p.h b/src/quicktemplates/qquickdeferredpointer_p_p.h
new file mode 100644
index 0000000000..e1fa85e2ee
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+++ b/src/quicktemplates/qquickdeferredpointer_p_p.h
@@ -0,0 +1,134 @@
+// Copyright (C) 2017 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 QQUICKDEFERREDPOINTER_P_P_H
+#define QQUICKDEFERREDPOINTER_P_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+#include <QtQml/private/qbipointer_p.h>
+#include <QtQml/private/qqmlcomponent_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QQuickUntypedDeferredPointer
+{
+    Q_DISABLE_COPY_MOVE(QQuickUntypedDeferredPointer)
+public:
+    QQmlComponentPrivate::DeferredState *deferredState() const
+    {
+        return value.isT1() ? nullptr : &value.asT2()->state;
+    }
+
+    void clearDeferredState()
+    {
+        if (value.isT1())
+            return;
+        value.clearFlag();
+        DeferredState *state = value.asT2();
+        value = state->value;
+        delete state;
+    }
+
+    bool wasExecuted() const { return value.isT1() && value.flag(); }
+    void setExecuted()
+    {
+        Q_ASSERT(value.isT1());
+        value.setFlag();
+    }
+
+    bool isExecuting() const { return value.isT2() && value.flag(); }
+    bool setExecuting(bool b)
+    {
+        if (b) {
+            if (value.isT2()) {
+                // Not our state. Set the flag, but leave it alone.
+                value.setFlag();
+                return false;
+            }
+
+            value = new DeferredState {
+                QQmlComponentPrivate::DeferredState(),
+                value.asT1()
+            };
+            value.setFlag();
+            return true;
+        }
+
+        if (value.isT2()) {
+            value.clearFlag();
+            return true;
+        }
+
+        return false;
+    }
+
+protected:
+    QQuickUntypedDeferredPointer() = default;
+    QQuickUntypedDeferredPointer(void *v) : value(v)
+    {
+        Q_ASSERT(value.isT1());
+        Q_ASSERT(!value.flag());
+    }
+
+    QQuickUntypedDeferredPointer &operator=(void *v)
+    {
+        if (value.isT1())
+            value = v;
+        else
+            value.asT2()->value = v;
+        return *this;
+    }
+
+    ~QQuickUntypedDeferredPointer()
+    {
+        if (value.isT2())
+            delete value.asT2();
+    }
+
+    void *data() const { return value.isT1() ? value.asT1() : value.asT2()->value; }
+
+private:
+    struct DeferredState
+    {
+        QQmlComponentPrivate::DeferredState state;
+        void *value = nullptr;
+    };
+
+    QBiPointer<void, DeferredState> value;
+};
+
+template<typename T>
+class QQuickDeferredPointer : public QQuickUntypedDeferredPointer
+{
+    Q_DISABLE_COPY_MOVE(QQuickDeferredPointer)
+public:
+    Q_NODISCARD_CTOR QQuickDeferredPointer() = default;
+    ~QQuickDeferredPointer() = default;
+
+    Q_NODISCARD_CTOR QQuickDeferredPointer(T *v) : QQuickUntypedDeferredPointer(v) {}
+    QQuickDeferredPointer<T> &operator=(T *o) {
+        QQuickUntypedDeferredPointer::operator=(o);
+        return *this;
+    }
+
+    T *data() const { return static_cast<T *>(QQuickUntypedDeferredPointer::data()); }
+    operator bool() const { return data() != nullptr; }
+    operator T*() const { return data(); }
+    T *operator*() const { return data(); }
+    T *operator->() const { return data(); }
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKDEFERREDPOINTER_P_P_H