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#ifndef MLIB_ARRAY_H
#define MLIB_ARRAY_H
#include <stdbit.h>
#include <stddef.h>
#include <string.h>
#include "_allocator.h"
#include "_attrs.h"
typedef struct {
ptrdiff_t len, cap;
allocator_t mem;
} _mlib_arr_hdr_t;
[[_mlib_inline]]
static inline _mlib_arr_hdr_t *
_mlib_array_hdr(void *p, ptrdiff_t align)
{
ptrdiff_t pad = -sizeof(_mlib_arr_hdr_t) & (align - 1);
return (_mlib_arr_hdr_t *)((char *)p - pad - sizeof(_mlib_arr_hdr_t));
}
#define array_hdr(p) (_mlib_array_hdr(p, alignof(typeof(*(p)))))
#define array_len(p) (_mlib_array_hdr(p, alignof(typeof(*(p))))->len)
#define array_cap(p) (_mlib_array_hdr(p, alignof(typeof(*(p))))->cap)
#define array_new(mem, T, n) \
((T *)array_new((mem), (n), sizeof(T), alignof(T)))
#define array_resz(p, cap) \
((typeof(p))array_resz((p), (cap), sizeof(*(p)), alignof(typeof(*(p)))))
#define array_free(p) \
array_free((p), sizeof(*(p)), alignof(typeof(*(p))))
#define array_push(p, x) \
do { \
_mlib_arr_hdr_t *hdr = _mlib_array_hdr(*(p), alignof(typeof(**(p)))); \
if (hdr->len == hdr->cap) { \
*(p) = array_resz(*(p), hdr->len * 2); \
hdr = _mlib_array_hdr(*(p), alignof(typeof(**(p)))); \
} \
(*(p))[hdr->len++] = (x); \
} while (false)
#define array_extend(p, xs, n) \
do { \
_mlib_arr_hdr_t *hdr = _mlib_array_hdr((p), alignof(typeof(*(p)))); \
if (hdr->len + (n) <= hdr->cap) { \
(p) = array_resz((p), stdc_bit_ceil((size_t)hdr->len + (n))); \
hdr = _mlib_array_hdr((p), alignof(typeof(*(p)))); \
} \
memcpy(&(p)[hdr->len], (xs), (n) * sizeof(*xs)); \
hdr->len += (n); \
} while (false)
#define array_foreach(p, i) for (typeof(p) i = (p); i < (p) + array_len(p); i++)
void *(array_new)(allocator_t mem, ptrdiff_t nmemb, ptrdiff_t elemsz,
ptrdiff_t align);
void *(array_resz)(void *ptr, ptrdiff_t ncap, ptrdiff_t elemsz, ptrdiff_t align);
void (array_free)(void *ptr, ptrdiff_t elemsz, ptrdiff_t align);
#endif /* !MLIB_ARRAY_H */
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