Error conditions

<name>	code	description
NUL	1	"Unexpected null pointer in arguments"
OUT	2	"Output handle points to a non-null pointer"
MEM	3	"Memory allocation error"
PAIR	4	"Input has unpaired nonreal poles or zeros"

The status codes in the table above are stored in the constants IIRFILTERH_E<name>, and the status descriptions in IIRFILTERH_MSGE<name>. The source code with these messages is in IIRFilter.h on line l.112.