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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    1. Tim Sweeney‏ @TimSweeneyEpic 10 Dec 2018
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      The key mathematical property of equality is that a=b implies f(a)=f(b) for all possible functions f. It was a mistake of C++, C#, and Java to violate this. This is the ultimate cause of the conundrum @BarryRevzin discusses in https://brevzin.github.io/c++/2018/12/09/mixed-comparisons/ …

      11 replies 38 retweets 151 likes
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    2. Tim Sweeney‏ @TimSweeneyEpic 10 Dec 2018
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      Thus a programming-language comparison like 2==2.0f must either be false, or produce a compile-time error to report potential confusion when mismatching different data types. IEEE 754 makes the converse mistake by introducing an x such that x!=x.

      9 replies 2 retweets 37 likes
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      Tim Sweeney‏ @TimSweeneyEpic 10 Dec 2018
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      Similarly, given value x of type t, if a compiler allows automatic conversion to type u, then we should expect to have f(a)==f(u(a)) for all functions f, but most languages also violate this. Haskell and ML stand out as being honest about equality and conversions.

      11:43 AM - 10 Dec 2018
      • 3 Retweets
      • 30 Likes
      • Joseph Abrahamson Diogo Neves Nico Berlo Eusha Rizvi David Russell Yuval Itzchakov Eyal Lotem 🏴 Eric Gajnak Stefan von der Krone
      6 replies 3 retweets 30 likes
        1. Eyal Lotem  🏴‏ @EyalL 10 Dec 2018
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          Replying to @TimSweeneyEpic

          Haskell allows you to define custom equality that violates it, and has the silly non reflexive float equality too :(

          0 replies 0 retweets 1 like
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        1. Fortnite Asia Server XBOX‏ @AsiaServersXbox 10 Dec 2018
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          Replying to @TimSweeneyEpic

          Please add Asia servers to Xbox

          0 replies 1 retweet 0 likes
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        1. Zein‏ @Zein25894905 10 Dec 2018
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          Replying to @TimSweeneyEpic

          When I s your birthday? It’s for a project of mine

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        2. Andy Fingerhut‏ @AndyFingerhut 10 Dec 2018
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          Replying to @TimSweeneyEpic

          Even in purely functional languages, it kind of depends on what you mean by equality. For example, a set with no total order on keys, using hashing for speed, can give different results for a function "return the set elements in a list", for two sets with the same elements.

          1 reply 0 retweets 0 likes
        3. Andy Fingerhut‏ @AndyFingerhut 10 Dec 2018
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          Replying to @AndyFingerhut @TimSweeneyEpic

          Example of that in Haskell in an article I wrote on the topic: https://github.com/jafingerhut/thalia/blob/master/doc/other-topics/referential-transparency.md … If equals means "equal shape of data structure" then f(a) equal to f(b) is straightforward, but much less useful for comparing set equality.

          0 replies 0 retweets 0 likes
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        2. Luke‏ @Lucretia9000 10 Dec 2018
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          Replying to @TimSweeneyEpic

          Pure functional languages are useless, you can’t do anything useful without side effects, that’s why all functional languages provide ways to circumvent the type system.

          1 reply 0 retweets 0 likes
        3. Arne Schober‏ @Khipu_Kamayuq 11 Dec 2018
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          Replying to @Lucretia9000 @TimSweeneyEpic

          Side effects can be modeled using Kleisli composition. That is as pure as it gets and far from any type system hacks. AFAIK

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. corvus frugilegus‏ @glaebhoerl 12 Dec 2018
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          Replying to @TimSweeneyEpic

          (Is `f` implied to be a polymorphic function here?)

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