C vs C++, Part II, Beautiful & efficient

In the first part of this series, we used C++ features (operator overloading and templates) to eliminate all defines and macros necessary for using a Pin. This way, we achieved the same performance of C code, but slightly increased readability, and hugely increased code safety. The result is a library that looks like this:

template<uint16_t address_>
struct Register {
 void operator=   (uint8_t _r)
 {
  *reinterpret_cast<volatile uint8_t*>(address_) = _r;
 }
 operator uint8_t   () const
 {
  return *reinterpret_cast<volatile uint8_t*>(address_);
 }
 operator volatile uint8_t& ()
 {
  return *reinterpret_cast<volatile uint8_t*>(address_);
 }

 template<uint8_t bit_>
 void setBit() { *reinterpret_cast<volatile uint8_t*>(address_) |= (1 << bit_); }
 template<uint8_t bit_>
 void clearBit() { *reinterpret_cast<volatile uint8_t*>(address_) &= ~(1 << bit_); }
};

Register<0x24> DDRB;
Register<0x25> PORTB;

constexpr uint8_t DDB5 = 5;
constexpr uint8_t PORTB5 = 5;