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,
- We create an original list named
originalList
using std::list with some elements. - We create a new list named
copiedList
and initialize it with the elements oforiginalList
. - After the operation,
copiedList
contains all elements oforiginalList
. - 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,
- We create an original list named
originalList
using std::list with some elements. - We create a new list named
copiedList
. - We use the
assign()
method ofcopiedList
and pass the range oforiginalList
to copy its elements. - After the operation,
copiedList
contains all elements oforiginalList
. - 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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