Hairy Control Structure
According to Hewitt, Peter Landin had introduced an even more powerful control structure using his "J" (for Jump) operator that could perform a non-local goto into the middle of a procedure invocation. In fact the "J" operator could jump back into the middle of a procedure invocation even after it had already returned. Drew McDermott and Gerald Sussman called Landin's concept the "Hairy Control Structure" and used it in the form of a nonlocal goto for the Conniver programming language. Scott Fahlman used Conniver in his planning system for robot construction tasks. This is related to what are now called re-invocable continuations.
Difficulties in communication were a root cause of the control structure difficulties.
Read more about this topic: Planner (programming Language)
Famous quotes containing the words hairy, control and/or structure:
“There is the old brute, too, the savage, the hairy man who dabbles his fingers in ropes of entrails; and gobbles and belches; whose speech is guttural, visceral—well, he is here. He squats in me.”
—Virginia Woolf (1882–1941)
“Men who have been raised violently have every reason to believe it is appropriate for them to control others through violence; they feel no compunction over being violent to women, children, and one another.”
—Frank Pittman (20th century)
“In the extent and proper structure of the Union, therefore, we behold a republican remedy for the diseases most incident to republican government.”
—James Madison (1751–1836)