Key Takeaways

While declaring local variables const is desirable, let’s avoid declaring member variables as const.

• const member variables cannot be changed, so a class with const members loses copy assignment and move semantics.
• Using const_cast might lead to undefined behaviour, so we won’t use it as a workaround in the above mentioned special functions.
• Whenever we see const members in a class during a code review (or in already checked-in code), remember what we just learned.