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Hacktical C: practical hacker's guide to the C programming language

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218 points signa11 | 1 comments | 14 Apr 25 10:20 UTC | HN request time: 0s | source
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throwaway7894 ◴[14 Apr 25 13:39 UTC] No.43681154[source]▶

  #define hc_task_yield(task)   
  do {     
    task->state = __LINE__;   
    return;     
    case __LINE__:;           
  } while (0)
That's just diabolical. I would not have thought to write "case __LINE__". In the case of a macro, using __LINE__ twice expands to the same value where the macro is used, even if the macro has newlines. It makes sense, but TIL.
replies(5): >>43681327 #>>43681410 #>>43681515 #>>43681600 #>>43684691 #
1. tanelpoder ◴[14 Apr 25 18:46 UTC] No.43684691[source]▶
I've written C on-and-off for over 30 years (just various throw-away prototypes and OS/app interaction microbenchmarks) and it took a while + a web search to get it. Diabolical indeed. Edit: And makes sense in hindsight.