<div dir="auto">It appear more like Show, you can add a constraint to the generic instance<div dir="auto"><br></div><div dir="auto">instance Show a => Foo a where</div><div dir="auto"> bar x = show x<br><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">Em 29 de jun de 2017 2:16 PM, "Silent Leaf" <<a href="mailto:silent.leaf0@gmail.com">silent.leaf0@gmail.com</a>> escreveu:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">hi,<div><br></div><div>say i have the following typeclass:</div><div><br></div><div>class Foo a where</div><div> bar :: a -> String</div><div><br></div><div>looks a lot like the Read typeclass, right? (at least i think it should?)</div><div>well say it's a different meaning (in other terms i can't or do not want to use Read, but i'd like to implement a default version of bar for those instances that also implement Read. is there a way to do so?</div></div>
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