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  <div class="vevent h-event"> <h1 class="summary p-name">Galois Tech Talk: The Constrained-Monad Problem</h1> <div class='date'><time class="dtstart dt-start" title="2013-06-25T10:30:00" datetime="2013-06-25T10:30:00">Tuesday, June 25, 2013 from 10:30</time>–<time class="dtend dt-end" title="2013-06-25T11:30:00" datetime="2013-06-25T11:30:00">11:30am</time></div> <div class="location vcard p-location h-card"> <a class="url" href='http://calagator.org/venues/202390439'><span class='fn org p-name'>Galois, Inc</span></a> <div class="adr p-adr h-adr"> <div class="street-address p-street-address">421 SW 6th Ave. Suite 300</div> <span class="locality p-locality">Portland</span> , <span class="region p-region">OR</span> <span class="postal-code p-postal-code">97204</span> <div class="country-name p-country-name">US</div> (<a href='https://maps.google.com/maps?q=421%20SW%206th%20Ave.%20Suite%20300,%20Portland%20OR%2097204%20US'>map</a>) </div> </div> <div class="description p-description"> <p>Presented by Neil Sculthorpe.</p> <p>In Haskell, there are many data types that would form monads were it not for the presence of type-class constraints on the operations on that data type. This is a frustrating problem in practice, because there is a considerable amount of support and infrastructure for monads that these data types cannot use. This talk will demonstrate that a monadic computation can be restructured into a normal form such that the standard monad class can be used. The technique is not specific to monads --- it can also be applied to other structures, such as applicative functors. One significant use case for this technique is Domain Specific Languages, where it is often desirable to compile a deep embedding of a computation to some other language, which requires restricting the types that can appear in that computation.</p> </div> <h3>Links</h3> <ul> <li><a class="url u-url" href="http://corp.galois.com/blog/2013/6/17/tech-talk-the-constrained-monad-problem.html">Website</a></li> </ul> </div>