You can check if the address is 0, but the value of the nullptr is implementation definied behaviour. You can have a system where the null pointer is 4. And ad

You can check if the address is 0, but the value of the nullptr is implementation definied behaviour. You can have a system where the null pointer is 4. And address 0 isn't too special on a machine level either. Embedded systems have valid data to read and write there.