+ BOOST_CHECK_EQUAL(ffactory.add_creator("xfilter", xfilter_creator),
+ true);
+ BOOST_CHECK_EQUAL(ffactory.drop_creator("xfilter"),
+ true);
+ BOOST_CHECK_EQUAL(ffactory.add_creator("xfilter", xfilter_creator),
+ true);
+ BOOST_CHECK_EQUAL(ffactory.add_creator("yfilter", yfilter_creator),
+ true);