+ template<typename T> bool Extend(const std::string &key, T* p)
+ {
+ /* This will only add an item if it doesnt already exist,
+ * the return value is a std::pair of an iterator to the
+ * element, and a bool saying if it was actually inserted.
+ */
+ return this->Extension_Items.insert(std::make_pair(key, (char*)p)).second;
+ }
+
+ /** Extend an Extensible class.
+ *
+ * @param key The key parameter is an arbitary string which identifies the extension data
+ *
+ * You must provide a key to store the data as via the parameter 'key', this single-parameter
+ * version takes no 'data' parameter, this is used purely for boolean values.
+ * The key will be inserted into the map with a NULL 'data' pointer. If the key already exists
+ * then you may not insert it twice, Extensible::Extend will return false in this case.
+ *
+ * @return Returns true on success, false if otherwise
+ */
+ bool Extend(const std::string &key)
+ {
+ /* This will only add an item if it doesnt already exist,
+ * the return value is a std::pair of an iterator to the
+ * element, and a bool saying if it was actually inserted.
+ */
+ return this->Extension_Items.insert(std::make_pair(key, (char*)NULL)).second;
+ }