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dibblego's profile
Tony Morris
Tony Morris
Tony Morris
@dibblego

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Tony Morris

@dibblego

Power ∧ Attitude ⇒ Performance

Brisbane, Australia
tmorris.net
Joined May 2009

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    1. Tony Morris‏ @dibblego 4 Feb 2015

      What is the type of this C# expression? (f, a, b) => from aa in a from bb in b select f(aa, bb)

      2 replies 0 retweets 0 likes
    2. Steve Goguen‏ @sgoguen 4 Feb 2015
      Replying to @dibblego

      @dibblego I'm going to guess it did not infer Func<Func<a,b,c>, IEnumerable<a>, IEnumerable<b>, IEnumerable<c>>

      1 reply 0 retweets 0 likes
    3. Tony Morris‏ @dibblego 4 Feb 2015
      Replying to @sgoguen

      @sgoguen Why should IEnumerable even come into it?

      1 reply 0 retweets 0 likes
    4. Steve Goguen‏ @sgoguen 4 Feb 2015
      Replying to @dibblego

      @dibblego AFAIK C# doesn't support types that generically covers both default implementations: IEnumerable and IQueryable. Am I close?

      1 reply 0 retweets 0 likes
    5. indifferent penguin‏ @kurt2001 4 Feb 2015
      Replying to @sgoguen

      @sgoguen @dibblego csc can't infer type of a lambda. Theoretically Func<Func<a,b,c>,M<a>,M<b>,M<c>> where M supports SelectMany aka bind?

      1 reply 0 retweets 0 likes
    6. Steve Goguen‏ @sgoguen 4 Feb 2015
      Replying to @kurt2001

      @kurt2001 @dibblego Thanks. I've been spending so much time with F#, I forgot this doesn't work. http://share.linqpad.net/lhl2tu.linq  :)

      1 reply 0 retweets 0 likes
    7. Mauricio Scheffer‏ @mausch 4 Feb 2015
      Replying to @sgoguen

      @sgoguen @kurt2001 @dibblego That doesn't work on F# either (modulo pervasive inlining), as .NET doesn't have type constructor polymorphism.

      1 reply 0 retweets 0 likes
    8. Steve Goguen‏ @sgoguen 4 Feb 2015
      Replying to @mausch

      @mausch @kurt2001 @dibblego I know. F# does infer IEnumerable for 'a' and 'b'. Return type is inferred from how/if expression is enclosed.

      1 reply 0 retweets 0 likes
    9. Tony Morris‏ @dibblego 4 Feb 2015
      Replying to @sgoguen

      @sgoguen @mausch @kurt2001 Why should it be IEnumerable and not say, Func<int, …> which has a useful SelectMany? https://gist.github.com/tonymorris/12029149ab4c876106c7 …

      2 replies 0 retweets 0 likes
    10. Steve Goguen‏ @sgoguen 4 Feb 2015
      Replying to @dibblego

      @dibblego @mausch @kurt2001 Don't get me wrong, I don't think IEnumerable is what it *should* be. I was answering what C#/F# actually do.

      1 reply 0 retweets 0 likes
      Tony Morris‏ @dibblego 4 Feb 2015
      Replying to @sgoguen

      @sgoguen @mausch @kurt2001 But it didn't. No IEnumerable here.

      8:06 AM - 4 Feb 2015
      2 replies 0 retweets 0 likes
        1. New conversation
        1. Steve Goguen‏ @sgoguen 4 Feb 2015
          Replying to @dibblego

          @dibblego I understand. FYI, I've written Linq implementations for funcs, CPS funcs, parsers, event streams... Type classes would be nice.

          1 reply 0 retweets 0 likes
        2. indifferent penguin‏ @kurt2001 4 Feb 2015
          Replying to @sgoguen

          @sgoguen @dibblego It's like typeclasses, but the methods/functions are hardwired in the compiler. Same in F# with computation expressions.

          0 replies 0 retweets 0 likes
          3. End of conversation
        1. Amar Potghan‏ @amarpotghan 4 Feb 2015
          Replying to @dibblego

          @dibblego @sgoguen expression is valid for types with Select and SelectMany. repetition inevitable. #lackofhigherkindedpolymorphism

          0 replies 0 retweets 0 likes
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