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Add syntax for MonadError, MonadReader, and MonadState #561

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ceedubs opened this issue Oct 5, 2015 · 6 comments
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Add syntax for MonadError, MonadReader, and MonadState #561

ceedubs opened this issue Oct 5, 2015 · 6 comments

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@ceedubs
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ceedubs commented Oct 5, 2015

Currently these type classes don't have syntax support.
@stew
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stew commented Jan 28, 2016

what would syntax support allow you to do that you can't do now?

@adelbertc
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i've found myself wanting MonadError#handleError

@stew
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stew commented Jan 29, 2016

ah yes, that one makes sense. I'm not sure what makes sense for Reader. i guess with state we can expose put and and modify but read doesn't make sense, right?

@adelbertc
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Agreed

@davegurnell
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I'm in need of handleError. I'll knock up a PR for ApplicativeError covering as many of these as I can work out:

  • raiseError
  • handleErrorWith
  • handleError
  • attempt
  • attemptT
  • recover
  • recoverWith

@davegurnell davegurnell mentioned this issue Mar 24, 2016
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@edmundnoble
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We have syntax for MonadReader and MonadState in cats-mtl; every transformer class has all of the syntax that makes sense for it.

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5 participants
@stew @davegurnell @ceedubs @adelbertc @edmundnoble