private function setup_variables() {

		/** Identifiers *******************************************************/

		// Post type identifiers
		$this->forum_post_type   = apply_filters( 'bbp_forum_post_type',  'forum'     );
		$this->topic_post_type   = apply_filters( 'bbp_topic_post_type',  'topic'     );
		$this->topic_tag_tax_id  = apply_filters( 'bbp_topic_tag_tax_id', 'topic-tag' );
		$this->reply_post_type   = apply_filters( 'bbp_reply_post_type',  'reply'     );

		// Status identifiers
		$this->spam_status_id    = apply_filters( 'bbp_spam_post_status',    'spam'    );
		$this->closed_status_id  = apply_filters( 'bbp_closed_post_status',  'closed'  );
		$this->orphan_status_id  = apply_filters( 'bbp_orphan_post_status',  'orphan'  );
		$this->public_status_id  = apply_filters( 'bbp_public_post_status',  'publish' );
		$this->pending_status_id = apply_filters( 'bbp_pending_post_status', 'pending' );
		$this->private_status_id = apply_filters( 'bbp_private_post_status', 'private' );
		$this->hidden_status_id  = apply_filters( 'bbp_hidden_post_status',  'hidden'  );
		$this->trash_status_id   = apply_filters( 'bbp_trash_post_status',   'trash'   );

		// Other identifiers
		$this->user_id           = apply_filters( 'bbp_user_id',        'bbp_user'        );
		$this->tops_id           = apply_filters( 'bbp_tops_id',        'bbp_tops'        );
		$this->reps_id           = apply_filters( 'bbp_reps_id',        'bbp_reps'        );
		$this->favs_id           = apply_filters( 'bbp_favs_id',        'bbp_favs'        );
		$this->subs_id           = apply_filters( 'bbp_subs_id',        'bbp_subs'        );
		$this->view_id           = apply_filters( 'bbp_view_id',        'bbp_view'        );
		$this->edit_id           = apply_filters( 'bbp_edit_id',        'edit'            );
		$this->paged_id          = apply_filters( 'bbp_paged_id',       'paged'           );
		$this->search_id         = apply_filters( 'bbp_search_id',      'bbp_search'      );
		$this->engagements_id    = apply_filters( 'bbp_engagements_id', 'bbp_engagements' );

		/** Queries ***********************************************************/

		$this->current_view_id      = 0; // Current view id
		$this->current_forum_id     = 0; // Current forum id
		$this->current_topic_id     = 0; // Current topic id
		$this->current_reply_id     = 0; // Current reply id
		$this->current_topic_tag_id = 0; // Current topic tag id
		$this->current_user_id      = 0; // Current topic tag id

		$this->forum_query    = new WP_Query();       // Main forum query
		$this->topic_query    = new WP_Query();       // Main topic query
		$this->reply_query    = new WP_Query();       // Main reply query
		$this->search_query   = new WP_Query();       // Main search query
		$this->user_query     = new BBP_User_Query(); // Main user query

		/** Theme Compat ******************************************************/

		$this->theme_compat   = new stdClass(); // Base theme compatibility class
		$this->filters        = new stdClass(); // Used when adding/removing filters

		/** Users *************************************************************/

		$this->current_user   = new WP_User(); // Currently logged in user
		$this->displayed_user = new WP_User(); // Currently displayed user

		/** Misc **************************************************************/

		$this->domain         = 'bbpress';      // Unique identifier for retrieving translated strings
		$this->extend         = new stdClass(); // Plugins add data here
		$this->errors         = new WP_Error(); // Feedback

		/** Deprecated ********************************************************/

		$this->tab_index      = apply_filters( 'bbp_default_tab_index', 100 );
	}