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// forward_list::before_begin
#include <iostream>
#include <forward_list>
int main ()
{
std::forward_list<int> mylist = {20, 30, 40, 50};
mylist.insert_after ( mylist.before_begin(), 11 );
std::cout << "mylist contains:";
for ( int& x: mylist ) std::cout << ' ' << x;
std::cout << '\n';
return 0;
}
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