This overloaded C++ operator directs input to an input stream.

This chaining operator >> connects two pool processors such that the output of the first processor is connected to the input of the second.

When the composite processor is asked to produce output, it passes this request directly to the consumer processor. The consumer will then pass a request for input to the producer. The producer will then ask for input from any processor which may afterwards be connected to its left. On receiving the input the producer will process it, and pass the output to the consumer. The consumer will then in turn process its input and pass the result into its output pool where it can be picked up by the original processor who asked for the composite operator to produce output.