Question

Seems that there is only doubly linked list (but no singly linked list) in the C++ standard library, right? Is there any widely-used C++ libraries with singly linked list?

Answer 1

There is slist, which is an SGI extension (__gnu_cxx::slist)

#include <iostream>
#include <iterator>
#include <ext/slist>

int main(int argc, char** argv) {
  __gnu_cxx::slist<int> sl;
  sl.push_front(1);
  sl.push_front(2);
  sl.push_front(0);
  std::copy(sl.begin(), sl.end(),  // The output is 0 2 1
            std::ostream_iterator<int>(std::cout, " "));
  std::cout << std::endl;
  return 0;
}