#pragma once

#include <common.h>

typedef struct arena {
	void* ptr;
	usize available;
	usize capacity;
} arena;

// The capacity has to be page-aligned
arena arena_init(usize capacity);

// The available size will be rounded up to a page boundary
// Will not grow beyond its capacity
void arena_ensure(arena* arena, usize available);

#define ARENA_ENSURE(T, arena, available) arena_ensure(arena, (available) * sizeof(T))