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#ifndef ARENA_H_
#define ARENA_H_
#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>
#include <assert.h>
#include <string.h>
typedef struct region region;
struct region {
region *next;
size_t cap;
size_t len;
uintptr_t data[];
};
typedef struct {
region *beg;
region *end;
} arena;
void *arena_alloc(arena *a, size_t size);
void arena_free(arena *a);
void grow_da(void *slice, size_t size, arena *arena);
#define new(a, t, c) (t *)arena_alloc(a, sizeof(t)*c)
#define ARENA_REGION_DEFAULT_CAPACITY (8*1024);
// from nullprogram
#define push(slice, arena) \
((slice)->len >= (slice)->cap \
? grow_da(slice, sizeof(*(slice)->data), arena), \
(slice)->data + (slice)->len++ \
: (slice)->data + (slice)->len++)
#endif //ARENA_H_
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