STL - List

[makan007]

The code is for STL - List. May I know what is 'splice' and how to get the answers as 0 & 6 respectively? Tks.

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

int main()
{
	list<int> list1;
	list<int> list2;
	
	list1.push_back(10);
	list1.push_back(20);
	list1.push_back(30);

	list2.push_back(1);
	list2.push_back(2);
	list2.push_back(3);

	list<int>::iterator pos = list1.begin();
	list1.splice(pos, list2);
	cout << "Size of list 2 is:" << list2.size() << endl; //Ans is 0
	cout << "Size of list 1 is:" << list1.size() << endl; //Ans is 6

}

[Albatross]

Splice is neat.

list::splice( iterator position, list<T,Allocator>& x );...

Moves elements from list x into the list container at the specified position, effectively inserting the specified elements into the container and removing them from x.

More here: http://cplusplus.com/reference/stl/list/splice/

-Albatross

[makan007]

Ok. I just noticed that I am looking at the output size. List2 size is empty & List1 size is 6 due to elements from List2 moves over to List1.

Tks Albatross.