Initial commit of tags added to properties to enable grouping.

include/openspace/properties/property.h

@@ -328,6 +328,20 @@ public:
      */
     const ghoul::Dictionary& metaData() const;
 
+    /**
+     * Returns a list of all tags that have been assigned to the Property. Useful for
+     * trying to find a match for a desired batch operation on Properties.
+     * \return Pointer to vector of string tags that were assigned to the Property
+     */
+    const std::vector<std::string>* getTags(void) const;
+
+    /**
+     * Adds a tag to the Property's list of assigned tags. Tags are useful for creating
+     * groups of Properties that can be used in batch operations.
+     * \param tag The string that is to be assigned to the Property
+     */
+    void addTag(std::string tag);
+
 protected:
     static const char* IdentifierKey;
     static const char* NameKey;
@@ -383,6 +397,9 @@ protected:
 
     /// The callback function that will be invoked whenever the encapsulated value changes
     std::function<void()> _onChangeCallback;
+
+    /// Collection of string tag(s) assigned to this property
+    std::vector<std::string> _tags;
 };
 
 } // namespace properties