Requirements on parallel_scan body

Class Body implementing the concept of parallel_reduce body must define: -

 Body::Body( Body&, split );

Splitting constructor. Split b so that this and b can accumulate separately -

 Body::~Body();

Destructor -

 void Body::operator()( const Range& r, pre_scan_tag );

Preprocess iterations for range r -

 void Body::operator()( const Range& r, final_scan_tag );

Do final processing for iterations of range r -

 void Body::reverse_join( Body& a );

Merge preprocessing state of a into this, where a was created earlier from b by b's splitting constructor

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