Question

How to insert all elements of forward_list2 at the beginning of forward_list1 in C++

Answer 1

#include <iostream>  
#include <forward_list> 

using std::forward_list;
using std::cout;

void printList(const forward_list<int>& flist)
{
	for (auto elem : flist) {
		cout << elem << ' ';
	}
	cout << std::endl;
}

int main()
{
	forward_list<int> flist1 = { 1, 2, 3, 4, 5 }, flist2 = { 77, 88, 99 };

	flist1.insert_after(flist1.before_begin(), flist2.begin(), flist2.end());

	printList(flist1);
	printList(flist2);

	return 0;
}

/*
run:

77 88 99 1 2 3 4 5
77 88 99

*/

 

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