{"id":150212,"date":"2001-09-01T00:00:00","date_gmt":"2001-09-01T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/object-oriented-style-overloading-for-haskell\/"},"modified":"2018-10-16T19:55:58","modified_gmt":"2018-10-17T02:55:58","slug":"object-oriented-style-overloading-for-haskell","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/object-oriented-style-overloading-for-haskell\/","title":{"rendered":"Object-Oriented Style Overloading for Haskell"},"content":{"rendered":"<p>Haskell has a sophisticated mechanism for overloading identi\ufb01ers with multiple de\ufb01nitions at distinct types. Object-oriented programming has a similar notion of overriding and overloading for methods names. Unfortunately, it is not possible to encode object-oriented overloading directly using Haskell overloading. This de\ufb01ciency becomes particularly tiresome when Haskell programs wish to call methods imported from an object-oriented library. We present two re\ufb01nements of Haskell\u2019s type class system: Closed classes and overlapping instances. We demonstrate how we may exploit the re\ufb01ned system so as to be able to encode object-oriented classes within Haskell. This encoding allows us to mimic, within Haskell, the overloading resolution rules employed by object-oriented languages without the need for additional type annotations or name mangling. As a consequence, object-oriented class libraries are very convenient to import and use within Haskell.<\/p>\n<h4>Errata (in both versions}<\/h4>\n<ul>\n<li>Fig 2, page 14 (conference version) or page 12 (tech report version): the declaration\n<pre>  class SubE e\r\n<\/pre>\n<p>should read<\/p>\n<pre>  class (SubI e, SubJ e) => SubE e\r\n<\/pre>\n<p>Similarly, in the same Figure, the declaration for class <tt>SubF<\/tt> should read<\/p>\n<pre>  class (SubE e) => SubF e<\/pre>\n<\/li>\n<\/ul>\n<p>Other versions<\/p>\n<ul>\n<li><a href=\"https:\/\/www.microsoft.com\/en-us\/research\/wp-content\/uploads\/2016\/07\/overloading.ppt\">powerpoint slides<\/a><\/li>\n<\/ul>\n<p>A technical report version of this paper is also available. 31 pages.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.microsoft.com\/en-us\/research\/wp-content\/uploads\/2016\/07\/overloading.pdf\">A4 pdf <\/a><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Haskell has a sophisticated mechanism for overloading identi\ufb01ers with multiple de\ufb01nitions at distinct types. Object-oriented programming has a similar notion of overriding and overloading for methods names. Unfortunately, it is not possible to encode object-oriented overloading directly using Haskell overloading. This de\ufb01ciency becomes particularly tiresome when Haskell programs wish to call methods imported from an [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"Workshop on Multi-Language Infrastructure and Interoperability (BABEL'01)","msr_chapter":"","msr_edition":"Workshop on Multi-Language Infrastructure and Interoperability (BABEL'01)","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"","msr_conference_name":"Workshop on Multi-Language Infrastructure and Interoperability 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