#16107: Meta ticket: unified sequence/lazy list objects
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Reporter: rws | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.4
Component: combinatorics | Resolution:
Keywords: days57, | Merged in:
LazyPowerSeries | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: #15852, #15673, #16137 |
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Comment (by dkrenn):
I am thinking about implementing !InfiniteSequences and have the following
design issue with the two possibilites (it is not restricted to the
infinite sequences, but is similar for other classes like words, stream in
the species, etc., as well):
1. make `lazy_list_generic` a base class of `InfiniteSequence`
2. make an attribute `values` (or similar) in the class `InfiniteSequence`
which will be an instance of `lazy_list_generic`
Both have advantages and disadvantages:
- `Sequence` uses list as a base class, thus `InfiniteSequence` should use
`lazy_list`
- With 1. you can only use `lazy_list_generic`, but no derived class like
`lazy_list_iterator` directly; you have to create a `lazy_list_generic`
which tracks the other (as its `master` attribute; is already implemented
since used with slices)
- With 2. you need to write methods for all the things you like from the
lazy lists (like building slices etc.). And even then, it is not a lazy
list, but just behaves like one.
What do you think?
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Ticket URL: <http://trac.sagemath.org/ticket/16107#comment:16>
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