Requirements on parallel_reduce body

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

 Body::Body( Body&, split );

Splitting constructor. Must be able to run concurrently with operator() and method join -

 Body::~Body();

Destructor -

 void Body::operator()( Range& r );

Function call operator applying body to range r and accumulating the result -

 void Body::join( Body& b );

Join results. The result in b should be merged into the result of this

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