create an iterator for a specified structure
produce the next structure
return true when the last structure is produced
one of a predefined list of available structures
argument list that corresponds to the structure struct
(optional) non-negative integer specifying the size of the object or the string 'allsizes' when the object should be selected from all possible sizes
iterator returned by a call to iterstructs
The iterstructs function returns an iterator in the form of a table. The nextstruct and finished functions are used to manipulate this table. The table entry nextvalue is a procedure created to traverse the elements defined by struct(args) of size n. The finished entry is a flag that is set to true when the last structure is produced.
The nextstruct command returns the next structure from the iterator defined by the call to iterstructs.
The finished function returns true when the last structure is produced.
If the size is not specified, the default size for that structure is used.
To list all the structures at once, see combstruct[allstructs].
For a list of available structures, see combstruct[structures].
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