How do I write custom iterators in C++?

Custom iterators in C++ enable you to define how to traverse your own data structures. This can be useful for collections or classes that require a specific iteration behavior. Below is a simple example of creating a custom iterator for a container class.


    #include <iostream>
    #include <iterator>
    #include <vector>

    class MyContainer {
    public:
        using iterator = std::vector<int>::iterator;

        void add(int value) {
            data.push_back(value);
        }

        iterator begin() {
            return data.begin();
        }

        iterator end() {
            return data.end();
        }

    private:
        std::vector<int> data;
    };

    int main() {
        MyContainer container;
        container.add(1);
        container.add(2);
        container.add(3);
        
        for (auto it = container.begin(); it != container.end(); ++it) {
            std::cout << *it << std::endl;
        }
        return 0;
    }

How do I write custom iterators in C++?

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How do I write custom iterators in C++?

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