CPP Operator Overloading & Type Conversions 2

Question 1

What is the correct member function signature for overloading the less-than operator for class T?

Accepted Answer

bool operator<(const T& other) const

Answer

bool operator<(T other)

Answer

T operator<(const T& other)

Answer

bool operator<(T& other)

Question 2

What is a conversion operator in C++?

Accepted Answer

A member function that converts an object to another type

Answer

A constructor that takes one argument of another type

Answer

A free function that casts primitive types

Answer

A template used for static_cast

Question 3

Why is it often preferable to implement a symmetric binary operator (like +) as a non-member function?

Accepted Answer

It allows implicit conversions on the left-hand operand as well

Answer

It runs faster as a non-member

Answer

Non-member operators bypass access control

Answer

It avoids the need to return by value

Question 4

For const-correctness, what does a class typically need to provide when overloading operator[]?

Accepted Answer

Both const and non-const versions

Answer

Only a const version

Answer

Only a non-const version

Answer

A static version returning a pointer

Question 5

What are user-defined literals in C++?

Accepted Answer

Operators that define custom suffixes for literal values

Answer

Custom string types defined with typedef

Answer

Macros that expand to compile-time constants

Answer

Template specializations for numeric conversions

Question 6

What does the 'rule of three' state in C++?

Accepted Answer

If you define a destructor, copy constructor, or copy assignment operator, you should define all three

Answer

A class should have at most three constructors

Answer

Always overload +, -, and * together

Answer

A function should not exceed three parameters

Question 7

In C++20, what type does the three-way comparison operator (operator<=>) return?

Accepted Answer

A comparison category such as std::strong_ordering

Answer

bool

Answer

int

Answer

char