LIL: abstract interfaces and supporting concrete data structures in Common Lisp
Home Page: http://github.com/fare/lisp-interface-library/
We wrote an article explaining about our library for ILC'2012: http://github.com/fare/lil-ilc2012/
A PDF of a slightly corrected version of the article is here: http://common-lisp.net/~frideau/lil-ilc2012/lil-ilc2012.pdf
An HTML of that version of the article is here: http://common-lisp.net/~frideau/lil-ilc2012/lil-ilc2012.html
A short introduction on our "Interface-Passing Style" of programming, is also at: http://fare.livejournal.com/155094.html
Features:
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LIL sports both pure (persistent) and stateful (ephemeral) variants of data structures in Interface-Passing Style, in the respective packages PURE and STATEFUL, with a common core for read-only operations and automatic transforms to go from stateful to pure and back.
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LIL supports data structures in traditional Object-Oriented Style, in both stateful (the usual Object-Oriented kind) and pure variants, in the respective packages POSH and CLASSY, with automatic transforms to go from Interface-Passing Style to traditional Object-Oriented Style and back.