Add Qt libs and headers

paho-mqtt3as-proxy/Qt/include/QtCore/qfuturesynchronizer.h

@@ -0,0 +1,78 @@
+// Copyright (C) 2016 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 QFUTURESYNCHRONIZER_H
+#define QFUTURESYNCHRONIZER_H
+
+#include <QtCore/qfuture.h>
+
+QT_REQUIRE_CONFIG(future);
+
+QT_BEGIN_NAMESPACE
+
+
+template <typename T>
+class QFutureSynchronizer
+{
+    Q_DISABLE_COPY(QFutureSynchronizer)
+
+public:
+    QFutureSynchronizer() : m_cancelOnWait(false) { }
+    explicit QFutureSynchronizer(QFuture<T> future)
+        : m_cancelOnWait(false)
+    { addFuture(std::move(future)); }
+    ~QFutureSynchronizer()  { waitForFinished(); }
+
+    void setFuture(QFuture<T> future)
+    {
+        waitForFinished();
+        m_futures.clear();
+        addFuture(std::move(future));
+    }
+
+    void addFuture(QFuture<T> future)
+    {
+        m_futures.append(std::move(future));
+    }
+
+    void waitForFinished()
+    {
+        if (m_cancelOnWait) {
+            for (int i = 0; i < m_futures.size(); ++i) {
+                 m_futures[i].cancel();
+            }
+        }
+
+        for (int i = 0; i < m_futures.size(); ++i) {
+             m_futures[i].waitForFinished();
+         }
+    }
+
+    void clearFutures()
+    {
+        m_futures.clear();
+    }
+
+    QList<QFuture<T> > futures() const
+    {
+        return m_futures;
+    }
+
+    void setCancelOnWait(bool enabled)
+    {
+        m_cancelOnWait = enabled;
+    }
+
+    bool cancelOnWait() const
+    {
+        return m_cancelOnWait;
+    }
+
+protected:
+    QList<QFuture<T>> m_futures;
+    bool m_cancelOnWait;
+};
+
+QT_END_NAMESPACE
+
+#endif // QFUTURESYNCHRONIZER_H