c++ - ERROR: slist was not declared in this scope -

this code isn't working me, getting below-mentioned compilation errors. please me point out mistake.

in function 'int main()': 4:3: error: 'slist' not declared in scope 4:9: error: expected primary-expression before 'int' 5:3: error: 'l' not declared in scope 12:9: error: expected primary-expression before 'int' 13:3: error: 'back' not declared in scope 

code:

int main() {   slist<int> l;   l.push_front(0);   l.push_front(1);   l.insert_after(l.begin(), 2);   copy(l.begin(), l.end(),        // output 1 2 0        ostream_iterator<int>(cout, " "));   cout << endl;    slist<int>::iterator = l.previous(l.end());   = l.insert_after(back, 3);    = l.insert_after(back, 4);   = l.insert_after(back, 5);   copy(l.begin(), l.end(),        // output 1 2 0 3 4 5        ostream_iterator<int>(cout, " "));   cout << endl; } 

all problems boil down fact following declaration

slist<int> l; 

throwed error that

slist not declared in scope

you need make sure slist declared in scope. include necessary headers.