#ifndef __VXGG_REWRITE___ARENA_H___25077218513438___
#define __VXGG_REWRITE___ARENA_H___25077218513438___

#include <stddef.h>

// Normal arena. Can expand in size beyond original allocation
typedef struct arena arena;

// A wrapper for the normal arena struct. Can not expand in size
typedef arena simplearena;

// Bitwise operation to check if a number is a power of 2
#define ISPOWOF2(x) (((x) & ((x) - 1)) == 0)

// Variable for memory alignment
static const size_t MEM_ALIGN_BYTES = (2 * sizeof(void*));

// Macro to get the remaining bytes necessary to be on a power of 2
#define MEM_ALIGN(x) ((x) + (((x) & (MEM_ALIGN_BYTES - 1)) != 0) * (MEM_ALIGN_BYTES - ((x) & (MEM_ALIGN_BYTES - 1))))


// Initialize an arena with `bytes` bytes of pre-allocated memory. Exits / returns NULL on error depending on the value of `___VXGG___USE_XALLOC_FOR_ARENAS___`
arena * arena_init(size_t bytes);

// Take `bytes` bytes of memory from `arena`'s memory pool. Exits / returns NULL on error depending on the value of `___VXGG___USE_XALLOC_FOR_ARENAS___`
void * arena_alloc(arena * const arena, size_t bytes);

// Free an arena its memory pool(s). Returns -1 and sets `errno` if the given arena is NULL 
void arena_free(void *a);


// Initializes a simple arena. 
simplearena * simplearena_init(size_t bytes);

// Grabs some memory from the simple arena's pool. Exits / returns NULL on error depending on the value of `___VXGG___USE_XALLOC_FOR_ARENAS___`
void * simplearena_alloc(simplearena * const a, size_t bytes);

// Free a simple arena. Exits / returns -1 on error depending on the value of `___VXGG___USE_XALLOC_FOR_ARENAS___`
void simplearena_free(simplearena *a);

#endif