Requirements on range concept

Class `R` implementing the concept of range must define:

- R::R( const R& );
  Copy constructor
- R::~R();
  Destructor
- bool R::is_divisible() const;
  True if range can be partitioned into two subranges
- bool R::empty() const;
  True if range is empty
- R::R( R& r, split );
  Split range `r` into two subranges.

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