#ifndef _CACHE_H_DEF
#define _CACHE_H_DEF
#include "norflash.h"

template<typename T, const unsigned N> class Cache {
  T data [N];
  unsigned begin_address;
  unsigned ofset_current;
  NorFlash nor;
  public:
    explicit Cache () noexcept : begin_address(0u), ofset_current(0u), nor() {}
    Cache & operator= (const unsigned addr) {
      begin_address = addr;
      ofset_current = 0u;
      reload ();
      return * this;
    }
    operator bool () { if (begin_address == 0u) return false; return true; }
    T * operator++ (int) {
      check_validity ();
      T * tmp = data + ofset_current;
      ofset_current += 1;
      return tmp;
    }
  protected:
    void check_validity () {
      if (ofset_current >= N) {
        begin_address += N * sizeof(T);
        reload ();
        ofset_current  = 0u;
      }
    }
    void reload () {
      unsigned char * ptr = reinterpret_cast<unsigned char *>(data);
      nor.ReadBlock (begin_address, ptr, N * sizeof(T));
    }
};

#endif // _CACHE_H_DEF