Implement a disk-based buffer pool class based on the LRU buffer pool replacement strategy. Disk blocks are numbered consecutively from the beginning of the file with the first block numbered as 0. Assume that blocks are 4096 bytes in size, with the first 4 bytes used to store the block ID corresponding to that buffer. Use the first BufferPool abstract class given in Section 8.3 as the basis for your implementation
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## Platform
class BufferPool{
public:
//Insert from space sz bytes beginning at position pos of
//the buffered store
virtual void insert(void* space, int sz, int pos) = 0;
//Put into space sz bytes beginning at position pos
//of the buffered store
virtual void getbytes(void* space, int sz, int pos) = 0;
};