How to Copy a List in C++ - Step by Step Examples

How to Copy a List in C++ ?

Answer

In C++ using std::list, you can copy a list by initializing a new list with the elements of the original list or by using the assign() method.


✐ Examples

1 Copy List by Initializing a New List

In this example,

  1. We create an original list named originalList using std::list with some elements.
  2. We create a new list named copiedList and initialize it with the elements of originalList.
  3. After the operation, copiedList contains all elements of originalList.
  4. Finally, we print both lists to demonstrate the copy operation.

C++ Program

#include <iostream>
#include <list>

int main() {
    std::list<int> originalList = {1, 2, 3, 4};
    std::list<int> copiedList(originalList.begin(), originalList.end());

    for (auto const& elem : originalList) {
        std::cout << elem << ' ';
    }
    std::cout << '\n';

    for (auto const& elem : copiedList) {
        std::cout << elem << ' ';
    }
    std::cout << '\n';

    return 0;
}

Output

1 2 3 4
1 2 3 4

2 Copy List Using assign() Method

In this example,

  1. We create an original list named originalList using std::list with some elements.
  2. We create a new list named copiedList.
  3. We use the assign() method of copiedList and pass the range of originalList to copy its elements.
  4. After the operation, copiedList contains all elements of originalList.
  5. Finally, we print both lists to demonstrate the copy operation.

C++ Program

#include <iostream>
#include <list>

int main() {
    std::list<int> originalList = {1, 2, 3, 4};
    std::list<int> copiedList;
    copiedList.assign(originalList.begin(), originalList.end());

    for (auto const& elem : originalList) {
        std::cout << elem << ' ';
    }
    std::cout << '\n';

    for (auto const& elem : copiedList) {
        std::cout << elem << ' ';
    }
    std::cout << '\n';

    return 0;
}

Output

1 2 3 4
1 2 3 4

Summary

In this tutorial, we learned How to Copy a List in C++ language with well detailed examples.


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