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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. Jonathan Blow‏ @Jonathan_Blow Jan 14
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      Suppose you have a C or C++-like programming language, but that has good built-in arrays. But you still support pointer math, because systems programmers need that. Should pointer subtraction divide by the size of the pointed-to type, like in C, or

      20 replies 7 retweets 68 likes
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    2. Jonathan Blow‏ @Jonathan_Blow Jan 14
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      is it better just to be simple, and just subtract the numbers and give people the bytes back, no matter what, regardless of type?

      47 replies 1 retweet 44 likes
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    3. shachaf‏ @shachaf Jan 14
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      Replying to @Jonathan_Blow

      It's pretty surprising for ((p + 1) - p) to be defined and not equal to p. I think it makes sense for it to either do the C thing or not be defined at all (e.g. with a different operator or an intrinsic for this operation).

      2 replies 0 retweets 4 likes
    4. shachaf‏ @shachaf Jan 14
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      Replying to @shachaf @Jonathan_Blow

      (Unless you also do addition by bytes, of course, and use &p[n] for C-style pointer addition. Either can work but consistency seems pretty important.)

      1 reply 0 retweets 0 likes
      Tim Sweeney‏ @TimSweeneyEpic Jan 14
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      Replying to @shachaf @Jonathan_Blow

      What does dimensional analysis say? That you can only add and subtract like units, and the operation produces the same units. So the C a[b]=b[a] thing is a weird language design artifact and not a principled feature. Given t* a and t* b, b-a must be illegal or be a t*.

      9:58 PM - 14 Jan 2020
      • 23 Likes
      • Ivan Braidi Crisuo Neuren Lazytigre Ben Reinhardt Vasilis Poulimenos Federico Vaggi gamedev at the end of time Filip Aničić Tikhon Jelvis
      3 replies 0 retweets 23 likes
        1. Jonathan Blow‏ @Jonathan_Blow Jan 14
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          Replying to @TimSweeneyEpic @shachaf

          Hmmmmmm, I had not considered this.

          0 replies 0 retweets 5 likes
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        2. shachaf‏ @shachaf Jan 14
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          Replying to @TimSweeneyEpic @Jonathan_Blow

          10°C - 5°C is meaningful (the difference is 5K) even though adding temperatures in °C or pointers isn't meaningful. The situation here is like torsors, where C-style addition is a group action of integers on pointers.

          1 reply 0 retweets 3 likes
        3. Daniel O'Connor‏ @Singularitarian Jan 14
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          Replying to @shachaf @TimSweeneyEpic @Jonathan_Blow

          Likewise, in math if A and B are points in space then B - A is a vector representing the displacement from A to B. So it's not meaningful to add points (locations in space), but we can take a difference of points to obtain a vector.

          1 reply 0 retweets 2 likes
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        1. Ulf Adams‏ @ulfjack Jan 15
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          Replying to @TimSweeneyEpic @shachaf @Jonathan_Blow

          There is a case where you can add two points in geometry (or temperatures): (p1+p2)/2 = p1+(p2-p1)/2

          0 replies 0 retweets 0 likes
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