#ifndef ARENA_H
#define ARENA_H

#define Align(pointer, alignment) align((u64)(pointer), (umm)(alignment))
#define PushStruct(arena, type) (type *)arena_alloc((arena), sizeof(type))
#define PushArray(arena, type, len) (type *)arena_alloc((arena), sizeof(type) * (len))
#define PushString(arena, len) (s8 *)arena_alloc((arena), sizeof(s8)*len))

typedef struct mem_arena  mem_arena;
typedef struct temp_arena temp_arena;

struct mem_arena
{
    u64 current_position;
    u64 previous_position;
    u64 capacity;
    u8 *base_position;
};

struct temp_arena
{
    mem_arena *arena;
    u64        start_position;
};

internal mem_arena *
arena_resize_align(
                   mem_arena *arena,
                   void      *old_memory,
                   u64        new_size,
                   u64        old_size,
                   umm        alignment);

internal mem_arena *
arena_resize(
             mem_arena *arena,
             void      *old_memory,
             u64        new_size,
             u64        old_size);

#endif