Solution: Copy-and-Swap Idiom

#include <string>
#include <utility>
#include <vector>
#include<iostream>
using namespace std;
class Foo {
  public:
    Foo(std::string name, std::vector<int> arr, int num ) {
      s = name;
      v = arr;
      num = i;
  }
    void swap(Foo& rhs) noexcept {
        using std::swap;
        s.swap(rhs.s);
        v.swap(rhs.v);
        swap(i, rhs.i);
    }
    void print(){
      cout<<s<<endl;
    }
 private:
  std::string s{};
  std::vector<int> v{};
  int i;
};
int main() {
  
    Foo foo("obj1", {1, 2}, 3);
    Foo foo2("obj2", {4, 5}, 6);
    foo.print();  // This should print obj1
    foo.swap(foo2);
    foo.print();  // After swapping is done this should print obj2
}