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

C++, std::deque, reserve capacity, shrink to fit, performance optimization

Learn how to efficiently manage memory with std::deque in C++, including reserving capacity and shrinking to fit.


        // Example of using std::deque in C++
        #include <iostream>
        #include <deque>

        int main() {
            std::deque myDeque;

            // Reserve capacity (Note: reserve is not available for std::deque)
            // std::deque does not have a reserve() method like vector.
            // Instead, we can use resize to allocate enough elements:
            myDeque.resize(10); // reserves space for 10 integers

            // Fill the deque with some values
            for(int i = 0; i < 10; ++i) {
                myDeque[i] = i * 10;
            }

            // Display the contents of the deque
            std::cout << "Contents of deque: ";
            for(const auto &value : myDeque) {
                std::cout << value << " ";
            }
            std::cout << std::endl;

            // Shrink to fit (Note: std::deque doesn't provide shrink_to_fit method)
            // Instead, we can create a new deque with the current size and swap
            std::deque smallerDeque(myDeque.begin(), myDeque.end());
            myDeque.swap(smallerDeque); // this will effectively "shrink" the deque

            // Display the contents of the new deque
            std::cout << "Contents after shrinking: ";
            for(const auto &value : myDeque) {
                std::cout << value << " ";
            }
            std::cout << std::endl;

            return 0;
        }

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

Popular Topics

Recent Languages

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

Related Questions

Popular Topics

Recent Languages