std::experimental::ranges::Mergeable

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Technical specifications
Filesystem library (filesystem TS)
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Iterators library
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Common algorithm requirements
                                                  
Mergeable
Concept utilities
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template < class I1, class I2, class Out, class R = ranges::less<>,

           class P1 = ranges::identity, class P2 = ranges::identity >
concept bool Mergeable =
  InputIterator<I1> &&
  InputIterator<I2> &&
  WeaklyIncrementable<Out> &&
  IndirectlyCopyable<I1, Out> &&
  IndirectlyCopyable<I2, Out> &&

  IndirectStrictWeakOrder<R, ranges::projected<I1, P1>, ranges::projected<I2, P2>>;
(ranges TS)

The Mergeable concept specifies the common requirements of algorithms that merge sorted sequences into an output sequence by copying the elements (for example, ranges::merge).