Move ScopedSwap template out of pp-engine.cpp and into the utils lib.

Change-Id: I9370da5f3159f6d8ad9ee9f8fe949f66eb235592
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/src/libs/utils/scopedswap.h b/src/libs/utils/scopedswap.h
new file mode 100644
index 0000000000..08bf4969b3
--- /dev/null
+++ b/src/libs/utils/scopedswap.h
@@ -0,0 +1,67 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef SCOPEDSWAP_H
+#define SCOPEDSWAP_H
+
+#if !(__cplusplus > 199711L || __GXX_EXPERIMENTAL_CXX0X__ || _MSC_VER >= 1600 || defined( _LIBCPP_VERSION )) || \
+    (defined(__GNUC_LIBSTD__) && ((__GNUC_LIBSTD__-0) * 100 + __GNUC_LIBSTD_MINOR__-0 <= 402))
+#  include <algorithm>
+#else // C++11
+#  include <utility>
+#endif
+
+
+namespace Utils {
+/// RAII object to save a value, and restore it when the scope is left.
+template<typename T>
+class ScopedSwap
+{
+    T oldValue;
+    T &ref;
+
+public:
+    ScopedSwap(T &var, T newValue)
+        : oldValue(newValue)
+        , ref(var)
+    {
+        std::swap(ref, oldValue);
+    }
+
+    ~ScopedSwap()
+    {
+        std::swap(ref, oldValue);
+    }
+};
+
+typedef ScopedSwap<bool> ScopedBoolSwap;
+
+} // Utils namespace
+
+#endif // SCOPEDSWAP_H