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combstruct[iterstructs] - create an iterator for a specified structure
combstruct[nextstruct] - produce the next structure
combstruct[finished] - return true when the last structure is produced
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Calling Sequence
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iterstructs(struct(args), size=n)
nextstruct(it)
finished(it)
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Parameters
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struct
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one of a predefined list of available structures
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args
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argument list that corresponds to the structure struct
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n
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(optional) non-negative integer specifying the size of the object or the string 'allsizes' when the object should be selected from all possible sizes
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it
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iterator returned by a call to iterstructs
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Description
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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  . The finished entry is a flag that is set to true when the last structure is produced.
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The nextstruct command returns the next structure from the iterator defined by the call to iterstructs.
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The finished function returns true when the last structure is produced.
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If the size is not specified, the default size for that structure is used.
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