<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Alcino Cunha</style></author><author><style face="normal" font="default" size="100%">Hugo Pacheco</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Calculating with Lenses: Optimising Bidirectional Transformations</style></title><secondary-title><style face="normal" font="default" size="100%">Proceedings of the 20th ACM SIGPLAN Workshop on Partial Evaluation and Program Manipulation </style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2011</style></year><pub-dates><date><style  face="normal" font="default" size="100%">January </style></date></pub-dates></dates><urls><related-urls><url><style face="normal" font="default" size="100%">https://haslab.uminho.pt/sites/default/files/alcino/files/pepm11.pdf</style></url></related-urls></urls><publisher><style face="normal" font="default" size="100%">ACM Press</style></publisher><pub-location><style face="normal" font="default" size="100%">Austin, USA</style></pub-location><pages><style face="normal" font="default" size="100%">91–100</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;This paper presents an equational calculus to reason about bidirectional transformations specified in the point-free style. In particular, it focuses on the so-calledlenses as a bidirectional idiom, and shows that many standard laws characterising point-free combinators and recursion patterns are also valid in that setting. A key result is that uniqueness also holds for bidirectional folds and unfolds, thus unleashing the power of fusion as a program optimisation technique. A rewriting system for automatic lens optimisation is also presented, to prove the usefulness of the proposed calculus.&lt;/p&gt;
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