Add a Version class and matching unit tests, roughly based on chrome/installe...

base/version.h

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_VERSION_H_
+#define BASE_VERSION_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+
+class Version {
+public:
+
+  // The version string must be made up of 1 or more uint16's separated
+  // by '.'. Returns NULL if string is not in this format.
+  // Caller is responsible for freeing the Version object once done.
+  static Version* GetVersionFromString(const std::wstring& version_str);
+  static Version* GetVersionFromString(const std::string& version_str);
+
+  ~Version() {}
+
+  bool Equals(const Version& other) const;
+
+  // Returns -1, 0, 1 for <, ==, >.
+  int CompareTo(const Version& other) const;
+
+  // Return the string representation of this version.
+  const std::string GetString() const;
+
+  const std::vector<uint16>& components() const { return components_; }
+
+private:
+  Version() {}
+  bool InitFromString(const std::string& version_str);
+
+  std::vector<uint16> components_;
+
+  DISALLOW_COPY_AND_ASSIGN(Version);
+};
+
+#endif  // BASE_VERSION_H_
+