build: WIP CMakeLists refactoring

shared/exception.h

@@ -0,0 +1,40 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef EXCEPTION_H
+#define EXCEPTION_H
+
+#include <stdexcept>
+#include <string>
+
+namespace Utils 
+{
+    class Exception:
+        public std::exception
+    {
+    public:
+        Exception();
+        virtual ~Exception();
+
+        virtual std::string getMessage() const = 0;
+
+        const char* what() const noexcept( true );
+    };
+}
+
+#endif // EXCEPTION_H