How to Copy a Vector in C++

How to Copy a Vector in C++ ?

Answer

In C++, you can copy a vector by using the copy constructor or by using the assignment operator.


✐ Examples

1 Copy a Vector using Copy Constructor

In this example,

  1. We create a vector named originalVector with some values.
  2. We use the copy constructor to create an independent copy named copiedVector.
  3. Any modifications made to originalVector will not affect copiedVector.

C++ Program

#include <iostream>
#include <vector>

int main() {
    std::vector<int> originalVector = {1, 2, 3, 4, 5};
    std::vector<int> copiedVector(originalVector);
    std::cout << "Original vector: ";
    for (int num : originalVector) {
        std::cout << num << " ";
    }
    std::cout << "\n";
    std::cout << "Copied vector: ";
    for (int num : copiedVector) {
        std::cout << num << " ";
    }
    std::cout << "\n";
    return 0;
}

Output

Original vector: 1 2 3 4 5
Copied vector: 1 2 3 4 5

2 Copy a Vector using Assignment Operator

In this example,

  1. We create a vector named originalVector with some values.
  2. We assign originalVector to copiedVector using the assignment operator (=).
  3. Any modifications made to originalVector will not affect copiedVector.

C++ Program

#include <iostream>
#include <vector>

int main() {
    std::vector<int> originalVector = {1, 2, 3, 4, 5};
    std::vector<int> copiedVector = originalVector;
    std::cout << "Original vector: ";
    for (int num : originalVector) {
        std::cout << num << " ";
    }
    std::cout << "\n";
    std::cout << "Copied vector: ";
    for (int num : copiedVector) {
        std::cout << num << " ";
    }
    std::cout << "\n";
    return 0;
}

Output

Original vector: 1 2 3 4 5
Copied vector: 1 2 3 4 5

Summary

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


More C++ Vectors Tutorials

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  2. How to Initialize a Vector in C++ ?
  3. How to Get Length of a Vector in C++ ?
  4. How to create a Vector of Size N in C++ ?
  5. How to create a Vector of Numbers from 1 to N in C++ ?
  6. How to create a Vector of Integers in C++ ?
  7. How to create a Vector of Strings in C++ ?
  8. How to create a Vector of Empty Vectors in C++ ?
  9. How to Access Items in a Vector in C++ ?
  10. How to get Item in a Vector at a Specific Index in C++ ?
  11. How to get First Item in a Vector in C++ ?
  12. How to get Last Item in a Vector in C++ ?
  13. How to Iterate Over a Vector in C++ ?
  14. How to Iterate Over a Vector with Index in C++ ?
  15. How to Iterate Over a Vector in Reverse Order in C++ ?
  16. How to check if a Vector is Empty in C++ ?
  17. How to check if a Vector is Not Empty in C++ ?
  18. How to get Sub Vector in C++ ?
  19. How to get the Index of Specified Item in a Vector in C++ ?
  20. How to check if a Specific Item is present in the Vector in C++ ?
  21. How to check if a Vector contains all the items of Another Vector in C++ ?
  22. How to count the Number of Occurrences of Specific Item in the Vector in C++ ?
  23. How to find the Item with Maximum Number of Occurrences in a Vector in C++ ?
  24. How to find the Item with Minimum Number of Occurrences in a Vector in C++ ?
  25. How to Sort a Vector in C++ ?
  26. How to Sort a Vector in Ascending Order in C++ ?
  27. How to Sort a Vector in Descending Order in C++ ?
  28. How to create a Two Dimensional Vector in C++ ?
  29. How to Iterate over a Two Dimensional Vector in C++ ?
  30. How to create a Three Dimensional Vector in C++ ?
  31. How to Copy a Vector in C++ ?
  32. How to Split a Vector in C++ ?
  33. How to Join Vectors in C++ ?
  34. How to Append an Item to a Vector in C++ ?
  35. How to Insert an Item at Specific Index in a Vector in C++ ?
  36. How to Append a Vector to another Vector in C++ ?
  37. How to Concatenate Two Vectors in C++ ?
  38. How to check if Two Vectors are Equal in C++ ?
  39. How to check if Two Vectors have Same Items (Regardless of Order) in C++ ?
  40. How to Convert a Vector of Integers to a Vector of Strings in C++ ?
  41. How to Convert a Vector of Strings to a Vector of Integers in C++ ?
  42. How to Convert a Vector of Floats to a Vector of Strings in C++ ?
  43. How to Convert a Vector of Strings to a Vector of Floats in C++ ?
  44. How to Reverse a Vector in C++ ?
  45. How to Shuffle a Vector in C++ ?
  46. How to Slice a Vector in C++ ?
  47. How to get First N Items from a Vector in C++ ?
  48. How to get Last N Items from a Vector in C++ ?
  49. How to Rotate Items in a Vector in C++ ?
  50. How to Filter Items of a Vector based on a Condition in C++ ?
  51. How to Remove Duplicates in a Vector in C++ ?
  52. How to Remove Item at a Specific Index from a Vector in C++ ?
  53. How to Remove Specific Item from a Vector in C++ ?
  54. How to Remove Items from Vector based on a Condition in C++ ?
  55. How to Sort a String Vector in Dictionary Order in C++ ?
  56. How to Concatenate Strings in Vector in C++ ?
  57. How to create a Vector of Vectors in C++ ?