swap in <algorithm>

[devLupin]

swap

---

• Exchanges the values of a and b
• template <class T> void swap (T& a, T& b)
• return : None

// example

#include <iostream>
#include <algorithm>
using namespace std;

int main(){

    int a = 3, b = 5;
    cout << "a: " << a << ", b: " << b << endl;
    swap(a, b);
    cout << "a: " << a << ", b: " << b << endl;

    return 0;
}

[devLupin]

swap_ranges

---

• Exchanges elements between range [first1, last1) and another range starting at first2.
• Parameters
  • first1, last1 : the first range of elements to swap
  • first2 : beginning of the second range of elements to swap
• N개의 원소를 교환하므로, last1이 주어지면 last2는 굳이 필요없음.

// example

#include <iostream>
#include <algorithm>
using namespace std;

int main(){

    int a[5] = {1, 2, 3, 4, 5};
    int b[5] = {6, 7, 8, 9, 10};
    swap_ranges(a, a+3, b);

    cout << "a:";
    for(int i=0; i<5; i++) cout << ' ' << a[i];
    cout << endl << "b:";
    for(int i=0; i<5; i++) cout << ' ' << b[i];
    cout << endl;

    return 0;
}