What are some advanced functional programming concepts in C++?

What are some advanced functional programming concepts in C++?

Advanced functional programming in C++ includes concepts like higher-order functions, lambda expressions, and immutability.

Can you explain higher-order functions with an example?

Sure! A higher-order function is a function that takes other functions as arguments or returns a function. For example, you can create a function that takes a function and a vector, applying that function to each element of the vector.

What about lambda expressions? How do they work?

Lambda expressions in C++ allow you to define anonymous functions. They are useful for short, inline functions, especially when used with algorithms like std::for_each.

Can you give me a code example of using a lambda expression?

Certainly! Here's a simple example:

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5};
    std::for_each(numbers.begin(), numbers.end(), [](int n) { std::cout << n * 2 << ' '; });
    return 0;
}

This code doubles each number in the vector and prints it.