Complete Modern C++ - Callbacks - Function Objects

The video tutorial explains function objects in C++, focusing on their use as callbacks and their advantages over function pointers. It covers the function call operator, template usage for comparators, and the benefits of inlining. The tutorial concludes with a comparison between function objects and pointers, highlighting the efficiency and statefulness of function objects. The next video will introduce Lambda expressions.

What is a function object also known as?

• Operator

• Lambda

• Pointer

• Functor

How is a function call operator invoked in a function object?

• Using a lambda expression

• Through a pointer

• Through an instance of a structure

• Directly as a global function

What is the main advantage of using a function object in sorting functions?

• It reduces memory usage

• It enables template-based generalization

• It simplifies the code

• It allows dynamic typing

Why can function objects be more efficient than function pointers?

• They use less memory

• They can be inlined by the compiler

• They are easier to write

• They are more dynamic

What unique feature do function objects have compared to global functions?

• They require less code

• They can store state

• They are faster to execute

• They are easier to debug

Which of the following is NOT a characteristic of function pointers?

• Can store state

• Dynamic in nature

• Difficult to optimize

• Invoked through an address

What is a more advanced mechanism for implementing callbacks in C++?

• Template functions

• Lambda expressions

• Function objects

• Function pointers