refs #297 Added CSettingsCache singleton derived class of CValueCache

for core settings, with context signal and slot for relay.

src/blackcore/settingscache.cpp

@@ -0,0 +1,25 @@
+/* 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.
+ */
+
+#include "settingscache.h"
+
+namespace BlackCore
+{
+
+    CSettingsCache::CSettingsCache() :
+        CValueCache(CValueCache::Distributed)
+    {}
+
+    CSettingsCache *CSettingsCache::instance()
+    {
+        static CSettingsCache cache;
+        return &cache;
+    }
+
+}