Tell HN: C Experts Panel – Ask us anything about C

Re:Tell HN: C Experts Panel – Ask us anything about C by rseacord on Tuesday April 14, 2020 @12:01PM (#22867578)

Yes, we have discussed adding this feature at scope level. A not entirely serious proposal was to implement it as follows:

  #define DEFER(a, b, c)  \
     for (bool _flag = true; _flag; _flag = false) \
     for (a; _flag && (b); c, _flag = false)

  int fun() {
     DEFER(FILE *f1 = fopen(...), (NULL != f1), mfclose(f1)) {
       DEFER(FILE *f2 = fopen(...), (NULL != f2), mfclose(f2)) {
         DEFER(FILE *f3 = fopen(...), (NULL != f3), mfclose(f3)) {
             ... do something ...
         }
       }
     }
  }

We are also looking at the attribute cleanup. Sounds like you should be involved in developing this proposal?

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Re:Tell HN: C Experts Panel – Ask us anything about C by a1369209993 on Wednesday April 15, 2020 @02:12AM (#22875078)

Apropos of this, I'll toss in: please support do-after statements (and also let statements).

  do foo(); _After bar();
  /* exactly equivalent to (with gcc ({})s): */
  ({ bar(); foo(); });
  #define DEFER(a, b, c) \
    _Let(a) if(!b) {} else do {c;} _After

(This is in fact a entirely serious proposal, though I don't actually expect it to happen.)

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Re:Tell HN: C Experts Panel – Ask us anything about C by rwmj on Tuesday April 14, 2020 @12:46PM (#22868204)

Yes, I'll ask around in Red Hat too, see if we can get some help with this.

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