checks whether an option is elective . concode_field_sep int URI_HOST concode_elem_sep int RESERVED_0 concode_elem_sep int URI_PATH concode_elem_sep String If_None_Match concode_elem_sep String Location_Path concode_elem_sep int ACCEPT concode_elem_sep int SIZE1 concode_elem_sep String Block1 concode_elem_sep int BLOCK1 concode_elem_sep String Block2 concode_elem_sep int CONTENT_FORMAT concode_elem_sep String Uri_Host concode_elem_sep String ETag concode_elem_sep int IF_NONE_MATCH concode_elem_sep String Size2 concode_elem_sep int ETAG concode_elem_sep long MAX_AGE concode_elem_sep int LOCATION_QUERY concode_elem_sep int LOCATION_PATH concode_elem_sep int URI_PORT concode_elem_sep String Max_Age concode_elem_sep String Uri_Query concode_elem_sep int UNKNOWN concode_elem_sep String Size1 concode_elem_sep int URI_QUERY concode_elem_sep int RESERVED_2 concode_elem_sep String Reserved concode_elem_sep String Proxy_Uri concode_elem_sep String Observe concode_elem_sep int RESERVED_4 concode_elem_sep int RESERVED_1 concode_elem_sep String Content_Format concode_elem_sep int OBSERVE concode_elem_sep int BLOCK2 concode_elem_sep int RESERVED_3 concode_elem_sep int SIZE2 concode_elem_sep String Location_Query concode_elem_sep int PROXY_SCHEME concode_elem_sep int IF_MATCH concode_elem_sep String Uri_Path concode_elem_sep String Proxy_Scheme concode_elem_sep int PROXY_URI concode_elem_sep String If_Match concode_elem_sep String Uri_Port concode_elem_sep String Accept concode_elem_sep int MAX_AGE concode_field_sep boolean isUriOption concode_elem_sep boolean isNoCacheKey concode_elem_sep boolean isUnsafe concode_elem_sep boolean isCacheKey concode_elem_sep boolean isCritical concode_elem_sep boolean isSingleValue concode_elem_sep String toString concode_elem_sep optionFormats getFormatByNr concode_elem_sep int toNumber concode_elem_sep boolean isSafe
boolean function ( int arg0 ) { return ( arg0 & 1 ) == 0 ; }