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  1. #ifndef STACK_H
  2. #define STACK_H
  3. #include <assert.h>
  4. #include <stdlib.h>
  5. #define stack_of(T) struct { size_t top; T value[]; }
  6.  
  7. #define operate(list, ...) {                                         \
  8.     size_t x = list ? list->top : 0                                  \
  9.          , y = x + 1;                                                \
  10.     if ((x & y) == 0) {                                              \
  11.         void *temp = realloc(list, sizeof *list                      \
  12.                                  + (x + y) * sizeof list->value[0]); \
  13.         if (!temp)                                                   \
  14.             return EXIT_FAILURE;                                     \
  15.         list = temp;                                                 \
  16.     }                                                                \
  17.     __VA_ARGS__;                                                     \
  18. }
  19.  
  20. #define push(list, v) operate(list, list->value[x] = v; list->top = y)
  21. #define pop(list) (assert(list && list->top), list->value[--list->top]); \
  22.                   operate(list, )
  23. #endif
  24.  
  25. // #include "stack.h" // embedded above
  26. #include <stdio.h>
  27. int main(void) {
  28.     stack_of(int) *fubar = NULL;
  29.     int x;
  30.     push(fubar, 42);
  31.     push(fubar, -1);
  32.     x = pop(fubar); printf("popped: %d\n", x);
  33.     x = pop(fubar); printf("popped: %d\n", x);
  34.     x = pop(fubar); printf("popped: %d\n", x);
  35.     free(fubar);
  36. }
Runtime error #stdin #stdout #stderr 0s 4380KB
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stdin
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Standard input is empty
stdout
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popped: -1
popped: 42
stderr
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prog: prog.c:34: main: Assertion `fubar && fubar->top' failed.
https://ideone.com/2LN6ik
language:
C99 (gcc 8.3)
created:
7 years ago
visibility:
public

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