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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. shachaf‏ @shachaf 18 Nov 2018
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      ALGOL 68 has the nice property that there are no variables/lvalues: There are names that are bound to constant values, and there are values that are addresses. "int x := 5" is shorthand for stack-allocating an int and binding x to its address (so the type of x is "ref int").

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    2. shachaf‏ @shachaf 18 Nov 2018
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      This seems much nicer than lvalues, which are probably much more complicated than most people think. The trouble is that dereferencing everything would be very annoying syntactically. ALGOL 68 solves that by implicitly coercing "ref t" to "t". I don't really like that.

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    3. shachaf‏ @shachaf 18 Nov 2018
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      For example, if you write "f(x)" in C, you know that x is being passed by value. If you write "f(x)" with implicit dereferencing, you can't tell without knowing the types. There are some other potential ambiguities. Is there a better solution to this?

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      Tim Sweeney‏ @TimSweeneyEpic 8 Aug 2019
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      Replying to @shachaf

      Those are the three sane designs: all values constant but there are pointers you can read or write; both constant and mutable values but you can only copy or pass mutable as pointers by taking addresses; and const+mutable+references+pointers.

      5:20 PM - 8 Aug 2019
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      • Domy 👍 Deep Learning Architect #YoMeQuedoEnCasa
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        2. shachaf‏ @shachaf 8 Aug 2019
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          Replying to @TimSweeneyEpic

          It's pretty odd that an lvalue is "a thing with an address" and a pointer is "the address of a thing". They're two views on the same thing but it works surprisingly well. Algol 68 has automatic dereferencing which seems worrying to me, but manual dereferencing gets cumbersome.

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        3. shachaf‏ @shachaf 8 Aug 2019
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          Replying to @shachaf @TimSweeneyEpic

          One thing that e.g. Haskell references can't do is "IORef (a,b) -> IORef a" (struct lvalue field access), which is of course critical in a language like C that cares about memory layout. This IRC conversation a while ago helped clarify things for me: http://slbkbs.org/ski-mercury.txt 

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        2. Tim Sweeney‏ @TimSweeneyEpic 8 Aug 2019
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          Replying to @TimSweeneyEpic @shachaf

          Clearly C++ got it wrong, and Algol68-ML-Haskell is semantically cleanest. C’s answer is probably best for the abstraction level of C, but once you get to things like templates or type classes with type deduction, the distinction between “int” and “const int” weighs heavy.

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        3. Tim Sweeney‏ @TimSweeneyEpic 8 Aug 2019
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          Replying to @TimSweeneyEpic @shachaf

          In a language that’s highly structured, you have to say how “int” and “const int” are distinguished for locals, data structure fields, inferred types, etc. Is it encoded in the type? In the name? In a third place? What happens to covariance? So maybe Algol68 is universally best.

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