class FlashStringTest : public FlashString
{
  public:
    FlashStringTest(uintptr_t address): _address(address) {}
    
    String toString() const;
    size_t printTo(Print& p) const;

    protected:
    uintptr_t _address;
};

String FlashStringTest::toString() const
{
  return String((const char *)_address);
}
 
 size_t FlashStringTest::printTo(Print& p) const
{
  size_t n = 0;
  const char* str = (const char*)_address;
  while (1) {
    char c = *str++;
    if (c == 0) break;
    if (p.print(c)) n++;
    else break;
  }
  return n;
}

#ifdef F
#undef F
#endif

#define F(string_literal) (FlashStringTest((uintptr_t)(string_literal)))