<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Miranda modelled IO as a (lazy) function from [Char] -> [Char] … pretty unwieldy to use “raw”, but it was made controllable by a set of combinators that could be seen as a proto-monadic library.<div class=""><br class=""></div><div class="">Simon Y.</div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 24 Oct 2016, at 15:50, Ronald Legere <<a href="mailto:rjljr2@gmail.com" class="">rjljr2@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span style="font-family: LucidaGrande; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">I must admit to some curiosity about this as well. My recollection was that the original approach was to use lazy streams </span><div style="font-family: LucidaGrande; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">IO:: [request] -> [respose]. </div><div style="font-family: LucidaGrande; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br class=""></div><div style="font-family: LucidaGrande; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">This can be managed a bit better using continuations (Perhaps continuations can also be considered a separate approach?)</div><div style="font-family: LucidaGrande; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br class=""></div><div style="font-family: LucidaGrande; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">And now we have the IO Monad. (which can be defined in terms of the stream based approach but is not implemented that way)</div><div style="font-family: LucidaGrande; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br class=""></div><div style="font-family: LucidaGrande; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">The only other approach I am aware of is Clean's "Unique types". </div></div></blockquote></div><br class=""><div class="">
<div class=""><span style="font-family: LucidaGrande;" class="">Simon Thompson | Professor of Logic and Computation </span><br class="" style="font-family: LucidaGrande;"><span style="font-family: LucidaGrande;" class="">School of Computing | University of Kent | Canterbury, CT2 7NF, UK</span><br class="" style="font-family: LucidaGrande;"><a href="mailto:s.j.thompson@kent.ac.uk" class="" style="font-family: LucidaGrande;">s.j.thompson@kent.ac.uk</a><span style="font-family: LucidaGrande;" class=""> | M +44 7986 085754 | W </span><a href="http://www.cs.kent.ac.uk/~sjt" class="" style="font-family: LucidaGrande;">www.cs.kent.ac.uk/~sjt</a></div>
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