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    But in STL, iterator classes are defined as a member classes of containers, so std::vector<int>::iterator is valid. Matt Austern's code defines the slist_iterator class to be an outside class of slist.
    – Leedehai
    Commented Aug 25, 2017 at 4:14
  • 1
    @user8385554: I think the idea is that Matt Austern's slist container would have typedefs for iterator and const_iterator to make the iterators available as though they were member types.
    – Adrian McCarthy
    Commented Sep 5, 2017 at 20:15
  • @L.F.: The question was asked in 2010, before std::conditional_t was a thing.
    – Adrian McCarthy
    Commented Oct 6, 2019 at 17:15
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    The original answer was also 2010, but it was link-only and the link eventually rotted. This recreated answer was 2016, but retains the context of the original question. It's true that std::conditional was a thing by 2016, but it wasn't yet implemented in all of the major compilers at that point.
    – Adrian McCarthy
    Commented Oct 8, 2019 at 23:44
  • Funny, the last link is down.
    – BAKE ZQ
    Commented Aug 26, 2020 at 14:44