refs #501, compareByPropertyIndex (performance for sort)

src/blackmisc/comparefunctions.h

@@ -0,0 +1,36 @@
+/* Copyright (C) 2015
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_COMPAREFUNCTIONS_H
+#define BLACKMISC_COMPAREFUNCTIONS_H
+
+#include "blackmisc/blackmiscexport.h"
+#include "blackmisc/variant.h"
+
+namespace BlackMisc
+{
+    namespace Compare
+    {
+        //! Compare bool
+        BLACKMISC_EXPORT int compare(bool a, bool b);
+
+        //! Compare int
+        BLACKMISC_EXPORT int compare(int a, int b);
+
+        //! Compare qint64
+        BLACKMISC_EXPORT int compare(qint64 a, qint64 b);
+
+        //! Compare qint64
+        BLACKMISC_EXPORT int compare(double a, double b);
+    } // ns
+} // ns
+
+#endif