Example

FilterMethods myfilter_methods = FILTER_METHODS_INITIALIZER;
	const Filter *myfilter;int myfilter_insert(FilterLayer *layer, pblock *pb)
	{if (pblock_findval("dont-insert-filter", pb)) return REQ_NOACTION;
	return REQ_PROCEED;}...myfilter_methods.insert = &myfilter_insert; 
	myfilter = filter_create("myfilter", &myfilter_methods);...