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H5L.iterate

Iterate over links

Syntax

[status,idx_out,opdata_out] = H5L.iterate(group_id,index_type,order,idx_in,iter_func,opdata_in)

Description

[status,idx_out,opdata_out] = H5L.iterate(group_id,index_type,order,idx_in,iter_func,opdata_in) iterates through the links in a group, specified by group_id, to perform a common function whose function handle is iter_func. H5L.iterate does not recursively follow links into subgroups of the specified group.

index_type and order establish the iteration. index_type specifies the index to be used. If the links have not been indexed by the index type, they will first be sorted by that index then the iteration will begin. If the links have been so indexed, the sorting step will be unnecessary, so the iteration may begin more quickly. Valid values include the following:

'H5_INDEX_NAME'Alpha-numeric index on name
'H5_INDEX_CRT_ORDER'Index on creation order

order specifies the order in which objects are to be inspected along the index specified in index_type. Valid values include the following:

'H5_ITER_INC'Increasing order
'H5_ITER_DEC'Decreasing order
'H5_ITER_NATIVE'Fastest available order

idx_in specifies the starting point of the iteration. idx_out returns the point at which iteration was stopped. This allows an interrupted iteration to be resumed.

The callback function iter_func must have the following signature:

function [status,opdata_out] = iter_func(group_id,name,opdata_in)

opdata_in is a user-defined value or structure and is passed to the first step of the iteration in the iter_func opdata_in parameter. The opdata_out of an iteration step forms the opdata_in for the next iteration step. The final opdata_out at the end of the iteration is then returned to the caller as opdata_out.

status value returned by iter_func is interpreted as follows:

zeroContinues with the iteration or returns zero status value to the caller if all members have been processed
positiveStops the iteration and returns the positive status value to the caller
negativeStops the iteration and throws an error indicating failure

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