//!
//!
//! [1]: http://en.wikipedia.org/wiki/Total_order
- //! [2]: http://en.cppreference.com/w/cpp/concept/LessThanComparable
+ //! [2]: http://en.cppreference.com/w/cpp/named_req/LessThanComparable
//! [3]: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3351.pdf
//! [4]: http://en.wikipedia.org/wiki/Strict_weak_ordering
template <typename Ord>