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  1. #include <stdio.h>
  2.  
  3. typedef int f_foo(int);
  4.  
  5. f_foo foo_runonce;
  6. f_foo foo_runonce_done;
  7. f_foo * foo = foo_runonce;
  8.  
  9. int main(void) {
  10.     int i;
  11.  
  12.     i = 0;
  13.     i += foo(42);
  14.     i += foo(13);
  15.     i += foo(4);
  16.     printf("Total: %d\n", i);
  17.     return 0;
  18. }
  19.  
  20. int foo_runonce(int x) {
  21.     printf("Run-once done!\n");
  22.     foo = foo_runonce_done;
  23.     return foo(x);
  24. }
  25.  
  26. int foo_runonce_done(int x) {
  27.     printf("%d\n", x);
  28.     return x;
  29. }
Success #stdin #stdout 0.02s 1676KB
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stdin
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Standard input is empty
stdout
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Run-once done!
42
13
4
Total: 59
https://ideone.com/CcbI46
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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