+ LIBPBD_TEMPLATE_MEMBER_API const Searchpath operator+ (const std::string& directory_path);
+
+ /**
+ * Remove all the directories in path from this.
+ */
+ LIBPBD_TEMPLATE_MEMBER_API Searchpath& operator-= (const Searchpath& spath);
+
+ /**
+ * Remove a directory path from the search path.
+ */
+ LIBPBD_TEMPLATE_MEMBER_API Searchpath& operator-= (const std::string& directory_path);