What are some examples of functional programming in C++?

What are some examples of functional programming in C++?

Functional programming in C++ can be demonstrated through the use of lambda functions, higher-order functions, and the STL algorithms.

Can you explain what a lambda function is?

A lambda function is an anonymous function defined using the syntax [] (parameters) { body }. It allows for inline function definitions.

How do I use higher-order functions in C++?

Higher-order functions are functions that take other functions as parameters or return them. You can use std::function to achieve this.

Can you give me a code example of using STL algorithms?

Sure! Here's an example using std::transform to apply a lambda function to a vector:

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

int main() {
    std::vector<int> vec = {1, 2, 3, 4};
    std::transform(vec.begin(), vec.end(), vec.begin(), [](int x) { return x * 2; });
    for (int n : vec) std::cout << n << ' '; // Outputs: 2 4 6 8
}