Installation with registry keys

src/shared/Utils.h

 #ifndef UTILS_H
 #define UTILS_H
 
 #include <algorithm>
 #include <locale>
 #include <functional>
 #include <string>
-
+#include <memory>
 
 bool IsWindowsVistaOrLater();
 
 std::string ToUtf8String(const std::wstring& str);
 std::wstring ToUtf16String(const std::string& str);
 std::wstring GetDllDir();
 std::wstring GetAppDataPath();
 
 template<class T>
 T TrimString(T text)
 {
   // Via http://stackoverflow.com/questions/216823/whats-the-best-way-to-trim-stdstring
   T trimmed(text);
   std::function<bool(T::value_type)> isspace = std::bind(&std::isspace<T::value_type>, std::placeholders::_1, std::locale::classic());
   trimmed.erase(trimmed.begin(), std::find_if(trimmed.begin(), trimmed.end(), std::not1(isspace)));
   trimmed.erase(std::find_if(trimmed.rbegin(), trimmed.rend(), std::not1(isspace)).base(), trimmed.end());
   return trimmed;
 }
 
+class Location {
+public:
+  /**
+    * Fully-qualified path to the file name of the engine executable.
+    */
+  static std::wstring engine();
+
+  /**
+    * Fully-qualified path to the locales/ directory. Ends in a backslash.
+    */
+  static std::wstring locales_dir();
+
+  /**
+    * Fully-qualified path to the html/ directory. Ends in a backslash.
+    */
+  static std::wstring html_dir();
+
+  /**
+    * Check that all the locations are known in the registry.
+    *
+    * While not a complete check of installation validity, this is a quick check to ensure that at least
+    * all the relevant registry keys are present. Strictly speaking, this is a development-cycle function,
+    * ensuring that the development environment is properly set up for testing.
+    */
+  static bool all_known();
+};
+
 #endif // UTILS_H