None of these operators are overloaded by default methods. In C++, the assignment operator (operator=) and the equality operator (operator==) must be explicitly overloaded if the programmer wants to define custom behavior for these operators in a class. Similarly, the decrement operator (operator--) also needs to be explicitly overloaded if desired. If the programmer does not provide custom implementations for these operators, the default behavior will be applied, which is typically a member-wise assignment for operator=, a member-wise comparison for operator==, and a decrement of the value for operator--.