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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