arenaallocator.h

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#pragma once
 
#include "memory/allocator.h"
#include <stddef.h>
 
#define CU_ARENA_CHUNK_SIZE 4096
 
struct cu_ArenaAllocator_Chunk {
  struct cu_ArenaAllocator_Chunk *prev; 
  size_t size;                          
  size_t used;                          
  unsigned char data[];                 
};
 
struct cu_ArenaAllocator_Header {
  struct cu_ArenaAllocator_Chunk *chunk; 
  size_t prev_offset;                    
};
typedef struct {
  cu_Allocator backingAllocator;           
  struct cu_ArenaAllocator_Chunk *current; 
  size_t chunkSize;                        
} cu_ArenaAllocator;
 
typedef struct {
  size_t chunkSize;                       
  cu_Allocator_Optional backingAllocator; 
} cu_ArenaAllocator_Config;
 
cu_Allocator cu_Allocator_ArenaAllocator(
    cu_ArenaAllocator *arena, cu_ArenaAllocator_Config config);
 
void cu_ArenaAllocator_destroy(cu_ArenaAllocator *arena);