How do I reserve capacity and shrink-to-fit with std::forward_list?

In C++, `std::forward_list` is a singly linked list that does not support direct capacity management like `std::vector` or `std::deque`. This means you cannot reserve capacity or shrink-to-fit an `std::forward_list` because it dynamically allocates memory as elements are added or removed.

To manage the memory and ensure efficient use, you can manually control the addition and removal of elements by using its member functions like push_front, pop_front, and iterators.

Here’s an example of using a `std::forward_list`:


        #include <forward_list>
        #include <iostream>

        int main() {
            std::forward_list flist;

            // Adding elements
            flist.push_front(10);
            flist.push_front(20);
            flist.push_front(30);
            
            // Displaying elements
            for (const auto& elem : flist) {
                std::cout << elem << " ";
            }
            std::cout << std::endl;

            // Removing elements
            flist.pop_front(); // removes the first element (30)

            // Displaying remaining elements
            for (const auto& elem : flist) {
                std::cout << elem << " ";
            }
            std::cout << std::endl;

            return 0;
        }

How do I reserve capacity and shrink-to-fit with std::forward_list?

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How do I reserve capacity and shrink-to-fit with std::forward_list?

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