Mastering C++: A Comprehensive Quiz Based on 'Thinking in C++

Operator overloading in C++ allows the programmer to define new meanings for existing operators when used with user-defined types.

Unlike option A, changing the evaluation precedence of operators is done with parentheses and is not related to operator overloading.

Option C is incorrect because operator overloading does not combine operators, but rather gives new meanings to existing ones.

Finally, option D is incorrect because operator overloading only applies to user-defined types, not built-in data types.

Therefore, option B is the correct choice as it accurately represents what operator overloading does in C++.