Function lilv_sys::lilv_plugin_get_num_ports_of_class

pub unsafe extern "C" fn lilv_plugin_get_num_ports_of_class(
    plugin: *const LilvPlugin, 
    class_1: *const LilvNode,
     ...
) -> u32

Get the number of ports on this plugin that are members of some class(es). Note that this is a varargs function so ports fitting any type 'profile' desired can be found quickly. REMEMBER TO TERMINATE THE PARAMETER LIST OF THIS FUNCTION WITH NULL OR VERY NASTY THINGS WILL HAPPEN.