Fibonacci calculation with cache

#include <filesystem>
#include <functional>
#include <iostream>
#include <fstream>
#include <numeric>
#include <string>
#include <vector>
#include <ranges>
#include <future>
#include <thread>
#include <mutex>
#include <deque>
#include <map>
#include <set>

class Fibonacci {
private:
    std::vector<uint64_t> m_results = { 0, 1 };
public:
    uint64_t calculate(size_t index) {
        std::cout << "Call calculate for index => " << index << std::endl;
        if (m_results.size() > index)
            return m_results[index];

        std::cout << "\tCache miss" << std::endl;

        auto result = calculate(index - 1) + calculate(index - 2);
        m_results.push_back(result);//try delete :=)
        return result;
    }
};


int main() {
    auto calculator = Fibonacci{};
    std::cout << std::format("Result => {}", calculator.calculate(25)) << std::endl;
}