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diff --git a/logic/BaseVersion.h b/logic/BaseVersion.h
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+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+#include <QSharedPointer>
+
+/*!
+ * An abstract base class for versions.
+ */
+struct BaseVersion
+{
+	/*!
+	 * A string used to identify this version in config files.
+	 * This should be unique within the version list or shenanigans will occur.
+	 */
+	virtual QString descriptor() = 0;
+	
+	/*!
+	 * The name of this version as it is displayed to the user.
+	 * For example: "1.5.1"
+	 */
+	virtual QString name() = 0;
+	
+	/*!
+	 * This should return a string that describes
+	 * the kind of version this is (Stable, Beta, Snapshot, whatever)
+	 */
+	virtual QString typeString() const = 0;
+};
+
+typedef QSharedPointer<BaseVersion> BaseVersionPtr;
+
+Q_DECLARE_METATYPE( BaseVersionPtr )
+\ No newline at end of file