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# 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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