How do I write view adaptors that cache results?

View adaptors in C++ can be highly efficient when they utilize caching. Caching results can greatly enhance performance, especially when dealing with expensive computations or repeated data accesses. By storing the results of function calls, we can avoid unnecessary recomputation and improve the overall efficiency of our application.

Example of a Cached View Adaptor in C++

Below is a simple implementation of a view adaptor that caches results.


    #include 
    #include 
    #include 

    class CachedViewAdaptor {
    public:
        // Constructor that takes a function to adapt
        CachedViewAdaptor(std::function func) : func_(func) {}

        // Method to get result with caching
        int get(int input) {
            auto it = cache_.find(input);
            if (it != cache_.end()) {
                // Return cached result
                return it->second;
            }
            // Call the function and cache the result
            int result = func_(input);
            cache_[input] = result;
            return result;
        }

    private:
        std::function func_;
        std::unordered_map cache_;
    };

    int main() {
        // Example usage: Square function
        CachedViewAdaptor squareAdaptor([](int x) { return x * x; });
        std::cout << "Square of 4: " << squareAdaptor.get(4) << '\n'; // Computes and caches
        std::cout << "Square of 4: " << squareAdaptor.get(4) << '\n'; // Retrieves from cache
        return 0;
    }

How do I write view adaptors that cache results?

Example of a Cached View Adaptor in C++

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How do I write view adaptors that cache results?

Example of a Cached View Adaptor in C++

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