std::experimental::ranges::Sortable

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template <class I, class R = ranges::less<>, class P = ranges::identity>

concept bool Sortable =
  Permutable<I> &&

  IndirectStrictWeakOrder<R, ranges::projected<I, P>>;
(ranges TS)

The Sortable concept specifies the common requirements of algorithms that permute sequences into ordered sequences (for example, ranges::sort).