What are the differences between function objects and lambda expressions in C++?

What are the differences between function objects and lambda expressions in C++?

Function objects are instances of classes with an overloaded operator(), while lambda expressions are anonymous functions defined inline.

Can you give me an example of a function object?

Sure! Here's a simple example:

struct Add {
    int operator()(int a, int b) { return a + b; }
};

This defines a function object that adds two integers.

And how would a lambda expression look for the same functionality?

A lambda expression for adding two integers would look like this:

auto add = [](int a, int b) { return a + b; };

This creates an anonymous function that performs the same addition.

What are the advantages of using lambda expressions over function objects?

Lambda expressions are more concise and can capture variables from their surrounding scope, making them more flexible for certain tasks.