117. Polymorphic Driver Shutdown

You are given a firmware-style driver framework with a common base driver interface and two derived drivers:

• SPI driver
• I2C driver

A driver object is created at runtime based on input and destroyed through a base-class pointer.

The program compiles and runs, but the shutdown sequence is incorrect:
part of the driver-specific cleanup logic is not executed.

Your task is to correct the class design so that the shutdown sequence is complete and correct for all driver types.

Input / Program Flow:

One integer value is read from standard input.

Input meaning:

• 0 → Create SPI driver
• 1 → Create I2C driver

Program flow:

• Read one integer value
• Create the corresponding driver object
• Store its address in a base-class pointer
• Destroy the object through the base-class pointer

Output:

If input is 0, the program must print exactly:

SPI driver shutdown
Base driver shutdown

If input is 1, the program must print exactly:

I2C driver shutdown
Base driver shutdown

Output requirements:

• Exactly two lines of output
• Exact text and order must match
• Output must be produced during object destruction

Constraints:

• Language standard: C++11
• Do NOT change function names or signatures
• Do NOT change how the object is destroyed
• Do NOT use STL containers
• You MAY modify class design
• Output must match exactly