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rexim/da_append.c

Created February 27, 2024 07:36
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  1. rexim created this gist Feb 27, 2024.
    27 changes: 27 additions & 0 deletions da_append.c
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,27 @@
    #include <stdio.h>
    #include <stdlib.h>

    #define da_append(xs, x) \
    do { \
    if ((xs)->count >= (xs)->capacity) { \
    if ((xs)->capacity == 0) (xs)->capacity = 256; \
    else (xs)->capacity *= 2; \
    (xs)->items = realloc((xs)->items, (xs)->capacity*sizeof(*(xs)->items)); \
    } \
    \
    (xs)->items[(xs)->count++] = (x); \
    } while (0)

    typedef struct {
    int *items;
    size_t count;
    size_t capacity;
    } Numbers;

    int main(void)
    {
    Numbers xs = {0};
    for (int x = 0; x < 10; ++x) da_append(&xs, x);
    for (size_t i = 0; i < xs.count; ++i) printf("%d\n", xs.items[i]);
    return 0;
    }