Reduces data from all ranks down to a single data variable that is sent to the root. The reduction is a binary tree reduction - each node reduces itself with it's children, and then sends its result to its parent, finally reaching the root

public virtual T Reduce<T>(
	int root,
	T data,
	ReductionOperation<T> operation,
	TimeSpan timeout
)

Public Overridable Function Reduce(Of T) ( _
	root As Integer, _
	data As T, _
	operation As ReductionOperation(Of T), _
	timeout As TimeSpan _
) As T

public:
generic<typename T>
virtual T Reduce(
	int root, 
	T data, 
	ReductionOperation<T>^ operation, 
	TimeSpan timeout
)