@param idx Index
@param reg Region specifier
@param getid Callback function to return the target ID for a name
@param hdr Input file header
@param itr_query Callback function returning an iterator for a numeric tid,
start and end position
@param readrec Callback to read a record from the input file
@return An iterator on success; NULL on error
The iterator struct returned by a successful call should be freed
via hts_itr_destroy() when it is no longer needed.
@param idx Index @param reg Region specifier @param getid Callback function to return the target ID for a name @param hdr Input file header @param itr_query Callback function returning an iterator for a numeric tid, start and end position @param readrec Callback to read a record from the input file @return An iterator on success; NULL on error
The iterator struct returned by a successful call should be freed via hts_itr_destroy() when it is no longer needed.