#ifndef _PERF_XYARRAY_H_
  #define _PERF_XYARRAY_H_ 1
  
  #include <sys/types.h>
  
  struct xyarray {
  	size_t row_size;
  	size_t entry_size;
  	char contents[];
  };
  
  struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size);
  void xyarray__delete(struct xyarray *xy);
  
  static inline void *xyarray__entry(struct xyarray *xy, int x, int y)
  {
  	return &xy->contents[x * xy->row_size + y * xy->entry_size];
  }
  
  #endif /* _PERF_XYARRAY_H_ */