How do I use emplace vs push with std::forward_list?

In C++, the `std::forward_list` is a singly linked list that allows for efficient insertion and removal of elements. Two common methods to add elements to a `std::forward_list` are `push_front` and `emplace_front`. Understanding the difference between these two methods is essential for maximizing performance and ensuring proper resource management.

std::forward_list, emplace, push, C++, performance, resource management, container, linked list

This content explains the usage of emplace vs push with std::forward_list in C++, including examples for better understanding.


        #include <iostream>
        #include <forward_list>

        // A simple struct for demonstration
        struct Data {
            int value;
            Data(int v) : value(v) {}  // Constructor
        };

        int main() {
            std::forward_list fl;

            // Using push_front
            fl.push_front(Data(1));  // Calls the constructor
            fl.push_front(Data(2));  // Calls the constructor again

            // Using emplace_front
            fl.emplace_front(3);      // Constructs Data(3) in place
            fl.emplace_front(4);      // Constructs Data(4) in place

            // Print the values
            for (const auto& item : fl) {
                std::cout << item.value << " ";
            }
            // Output will be: 4 3 2 1

            return 0;
        }

std::forward_list emplace push C++ performance resource management container linked list

How do I use emplace vs push with std::forward_list?

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How do I use emplace vs push with std::forward_list?

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