bp_core_screen_activation()

function bp_core_screen_activation() {

	// Bail if not viewing the activation page.
	if ( ! bp_is_current_component( 'activate' ) ) {
		return false;
	}

	// If the user is already logged in, redirect away from here.
	if ( is_user_logged_in() ) {

		// If activation page is also front page, set to members directory to
		// avoid an infinite loop. Otherwise, set to root domain.
		$redirect_to = bp_is_component_front_page( 'activate' )
			? bp_get_members_directory_permalink()
			: bp_get_root_domain();

		// Trailing slash it, as we expect these URL's to be.
		$redirect_to = trailingslashit( $redirect_to );

		/**
		 * Filters the URL to redirect logged in users to when visiting activation page.
		 *
		 * @since BuddyPress 1.9.0
		 *
		 * @param string $redirect_to URL to redirect user to.
		 */
		$redirect_to = apply_filters( 'bp_loggedin_activate_page_redirect_to', $redirect_to );

		// Redirect away from the activation page.
		bp_core_redirect( $redirect_to );
	}

	// Get BuddyPress.
	$bp = buddypress();

	/**
	 * Filters the template to load for the Member activation page screen.
	 *
	 * @since BuddyPress 1.1.1
	 *
	 * @param string $value Path to the Member activation template to load.
	 */
	bp_core_load_template( apply_filters( 'bp_core_template_activate', array( 'activate', 'registration/activate' ) ) );
}