How can I create a custom iterator in C++?

How can I create a custom iterator in C++?

To create a custom iterator in C++, you need to define a class that implements the iterator interface, including methods like begin(), end(), operator++, and operator*.

Can you show me a simple example of a custom iterator?

Sure! Here's a basic example of a custom iterator for a simple array:

class ArrayIterator {
    int* ptr;
public:
    ArrayIterator(int* p) : ptr(p) {}
    int& operator*() { return *ptr; }
    ArrayIterator& operator++() { ++ptr; return *this; }
    bool operator!=(const ArrayIterator& other) { return ptr != other.ptr; }
};

class Array {
    int* data;
    size_t size;
public:
    Array(int* d, size_t s) : data(d), size(s) {}
    ArrayIterator begin() { return ArrayIterator(data); }
    ArrayIterator end() { return ArrayIterator(data + size); }
};

This defines an iterator for an array.

What are the benefits of using custom iterators?

Custom iterators provide flexibility and allow you to define how your data structures can be traversed, making your code more intuitive and easier to use.

Are there any performance considerations I should be aware of?

Yes, while custom iterators can enhance code readability and usability, they may introduce overhead if not implemented efficiently. Always consider the complexity of your iterator operations.