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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    Rich Felker‏ @RichFelker Apr 5

    Wanted: a C++ compiler that expands each template just once with runtime branches for each possible type.

    4:49 PM - 5 Apr 2018
    • 2 Likes
    • le tiañ the network is just an abstraction layer
    3 replies 0 retweets 2 likes
      1. New conversation
      2. Matthew Fernandez‏ @wattsamata Apr 5
        Replying to @RichFelker

        I think you want inheritance and vtables, not templates...

        1 reply 0 retweets 0 likes
      3. Rich Felker‏ @RichFelker Apr 5
        Replying to @wattsamata

        What I want is for ppl to stop writing stuff in C++. But until that happens, a way to make the result less hellish.

        1 reply 0 retweets 0 likes
      4. Matthew Fernandez‏ @wattsamata Apr 5
        Replying to @RichFelker

        So a C++ compiler without template support would make you happy?

        1 reply 0 retweets 0 likes
      5. Rich Felker‏ @RichFelker Apr 5
        Replying to @wattsamata

        No because it couldn't compile any C++ programs, which is the only point of a C++ compiler. I don't want to *write* this hideous language. I want to compile stuff without it taking 100GB.

        1 reply 0 retweets 0 likes
      6. Matthew Fernandez‏ @wattsamata Apr 5
        Replying to @RichFelker

        Ah well then I have no solution for you. I share your sensibilities re conservative resource usage.

        0 replies 0 retweets 1 like
      7. End of conversation
      1. New conversation
      2. Robert Ou‏ @rqou_ Apr 5
        Replying to @RichFelker

        Have you considered: any programming language with actually-thought-out generics? :P For example Rust allows you to control explicitly whether generics will give you static dispatch by duplicating code or dynamic dispatch at runtime.

        2 replies 0 retweets 0 likes
      3. Rich Felker‏ @RichFelker Apr 5
        Replying to @rqou_

        I mean to compile existing C++ code with 5% of the resulting size and build-time resource requirements.

        1 reply 0 retweets 0 likes
      4. Brendan G Bohannon‏ @cr88192 Apr 6
        Replying to @RichFelker @rqou_

        would be nice. or, maybe a compiler that does N direct expansions, and beyond this quietly falls back to treating it more like a dynamic language (ex: using a lot of tagged dynamic types and implicit conditional branches)?...

        0 replies 0 retweets 0 likes
      5. End of conversation
      1. New conversation
      2. Charles Forsyth‏ @charles_forsyth Apr 5
        Replying to @RichFelker

        I tried to do something similar for Ada (not with runtime branches, but using actual-type-specific thunks passed by the caller). Sadly, Ada's generics break its "contract model": body determines legality of array use (constrained/unconstrained). It would otherwise have worked.

        1 reply 0 retweets 0 likes
      3. Charles Forsyth‏ @charles_forsyth Apr 5
        Replying to @charles_forsyth @RichFelker

        Having looked at C++ templates, though, I don't think there's a hope in hell of doing something similar for them (in general): they're really syntactic macros.

        2 replies 0 retweets 0 likes
      4. Rich Felker‏ @RichFelker Apr 5
        Replying to @charles_forsyth

        Just leave the AST in the output and include an AST interpreter. ;-)

        1 reply 0 retweets 0 likes
      5. Charles Forsyth‏ @charles_forsyth Apr 5
        Replying to @RichFelker

        That's not too far-fetched!

        0 replies 0 retweets 0 likes
      6. End of conversation

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