In certain scenarios, you might come across a situation where you need to sort a 2D vector containing custom objects in a specific order. Sorting a 2D vector can be a bit tricky compared to sorting a regular array or vector, but with the right approach, it can be easily accomplished.

Let’s assume we have a 2D vector named customObjects, which contains objects of a custom class named CustomObject. Each CustomObject has two attributes - name and score.

class CustomObject {
    public:
        std::string name;
        int score;
};
std::vector<std::vector<CustomObject>> customObjects;

Now, let’s say we want to sort this 2D vector based on the score attribute of the CustomObject. To achieve this, we can use the sort function along with a custom comparator.

First, we need to define our custom comparator function. This function will take two CustomObject objects and compare their scores.

bool customComparator(const CustomObject& obj1, const CustomObject& obj2) {
    return obj1.score < obj2.score;
}

Once the comparator function is defined, we can use it with the sort function to sort the vector.

std::sort(customObjects.begin(), customObjects.end(), customComparator);

That’s it! Now the customObjects 2D vector will be sorted based on the score attribute of the CustomObject. The objects with the lowest scores will be at the beginning of the vector, while the objects with the highest scores will be at the end.

Conclusion

In this article, we learned how to sort a 2D vector of custom objects in C++. By defining a custom comparator function and using it with the sort function, we can easily sort the vector based on the desired attribute of the objects. This technique can be useful in various scenarios where sorting a 2D vector is required.

#programming #cpp #sorting