Question

How to use front_inserter to append all existing list elements to the same list in C++

Answer 1

#include <iostream>
#include <list>
#include <iterator>

using std::list;
using std::cout;
using std::endl;

void print(const list<int>& lst)
{
	for (auto element : lst) {
		cout << element << ' ';
	}
	cout << endl;
}

int main()
{
	list<int> lst;

	front_inserter(lst) = 1;
	front_inserter(lst) = 2;
	front_inserter(lst) = 3;
	print(lst);

	copy(lst.begin(), lst.end(),  front_inserter(lst));
	print(lst);
}


/*
run:

3 2 1
1 2 3 3 2 1

*/

 

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