Can you provide examples of Boost Iterator in C++?

Can you provide examples of Boost Iterator in C++?

Sure! Boost Iterator is a powerful library that extends the capabilities of standard iterators. For example, you can use it to create a reverse iterator or a filtered iterator. Would you like to see a specific type of iterator?

Yes, please show me a filtered iterator example.

Alright! Here's a simple example of a filtered iterator that only iterates over even numbers in a vector:

#include <boost/range/iterator_range.hpp>
#include <boost/range/adaptor/filtered.hpp>
#include <vector>
#include <iostream>

int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5, 6};
    auto even_numbers = numbers | boost::adaptors::filtered([](int n) { return n % 2 == 0; });
    for (int n : even_numbers) {
        std::cout << n << " ";
    }
    return 0;
}

This will output: 2 4 6.

That's great! Can you explain how the filtered iterator works?

Certainly! The filtered iterator uses a predicate function to determine which elements to include. In the example, the lambda function checks if a number is even. Only those that return true are included in the iteration.