Add Qt libs and headers

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

@@ -0,0 +1,64 @@
+// Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Sérgio Martins <sergio.martins@kdab.com>
+// Copyright (C) 2019 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 QSCOPEGUARD_H
+#define QSCOPEGUARD_H
+
+#include <QtCore/qglobal.h>
+
+#include <type_traits>
+#include <utility>
+
+QT_BEGIN_NAMESPACE
+
+template <typename F>
+class [[nodiscard]] QScopeGuard
+{
+public:
+    explicit QScopeGuard(F &&f) noexcept
+        : m_func(std::move(f))
+    {
+    }
+
+    explicit QScopeGuard(const F &f) noexcept
+        : m_func(f)
+    {
+    }
+
+    QScopeGuard(QScopeGuard &&other) noexcept
+        : m_func(std::move(other.m_func))
+        , m_invoke(std::exchange(other.m_invoke, false))
+    {
+    }
+
+    ~QScopeGuard() noexcept
+    {
+        if (m_invoke)
+            m_func();
+    }
+
+    void dismiss() noexcept
+    {
+        m_invoke = false;
+    }
+
+private:
+    Q_DISABLE_COPY(QScopeGuard)
+
+    F m_func;
+    bool m_invoke = true;
+};
+
+template <typename F> QScopeGuard(F(&)()) -> QScopeGuard<F(*)()>;
+
+//! [qScopeGuard]
+template <typename F>
+[[nodiscard]] QScopeGuard<typename std::decay<F>::type> qScopeGuard(F &&f)
+{
+    return QScopeGuard<typename std::decay<F>::type>(std::forward<F>(f));
+}
+
+QT_END_NAMESPACE
+
+#endif // QSCOPEGUARD_H