What are the best practices for using function objects in C++?

What are the best practices for using function objects in C++?

When using function objects in C++, it's important to ensure they are lightweight and efficient. Prefer using lambdas for simple cases.

Can you explain what a function object is?

A function object, or functor, is an object that can be called as if it were a function. It typically overloads the operator().

What are some common use cases for function objects?

Common use cases include passing custom behavior to algorithms, such as sorting or filtering collections.

How do function objects compare to regular functions?

Function objects can maintain state and can be more flexible than regular functions, which are stateless.