How do I write custom views and view adaptors?

In C++, custom views and view adaptors provide an efficient way to create tailored views of data collections. Views allow you to manipulate the representation of underlying data without modifying it, and view adaptors enhance existing views with additional functionality.

Creating Custom Views

A custom view can be implemented using a class or a function, which allows you to define how a data collection should be presented or iterated over. Here's a simple example:


    // Custom View Example
    #include <vector>
    #include <iostream>
    
    class CustomView {
    public:
        CustomView(std::vector<int> &data) : data(data) {}
        
        void print() {
            for(auto& item : data) {
                std::cout << item << " ";
            }
            std::cout << std::endl;
        }
    
    private:
        std::vector<int> &data;
    };
    
    int main() {
        std::vector<int> numbers = {1, 2, 3, 4, 5};
        CustomView view(numbers);
        view.print(); // Output: 1 2 3 4 5
        return 0;
    }

Using View Adaptors

View adaptors can be used to modify the behavior of a view by adding filters or transformations. For example, you can create a view adaptor that filters out even numbers:


    // View Adaptor Example
    #include <vector>
    #include <iostream>
    
    class EvenFilter {
    public:
        EvenFilter(std::vector<int> &data) : data(data) {}
        
        void printOdd() {
            for(auto& item : data) {
                if(item % 2 != 0) {
                    std::cout << item << " ";
                }
            }
            std::cout << std::endl;
        }
    
    private:
        std::vector<int> &data;
    };
    
    int main() {
        std::vector<int> numbers = {1, 2, 3, 4, 5};
        EvenFilter filter(numbers);
        filter.printOdd(); // Output: 1 3 5
        return 0;
    }

How do I write custom views and view adaptors?

Creating Custom Views

Using View Adaptors

Popular Topics

Recent Languages

How do I write custom views and view adaptors?

Creating Custom Views

Using View Adaptors

Related Questions

Popular Topics

Recent Languages