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class
	TWO_WAY_CHAIN_ITERATOR [G]

General
	cluster: elks
	description: 
		"Objects that are able to iterate over two-way chains,
		on which they can perform repeated actions and tests according
		to a number of predefined control structures such as if,
		until and others."
	create: set

Ancestors
	LINEAR_ITERATOR [G]
	LINEAR_ITERATOR [G]

Queries
	exhausted: BOOLEAN
	for_all (test: FUNCTION [G, BOOLEAN]): BOOLEAN
	for_all_back (test: FUNCTION [G, BOOLEAN]): BOOLEAN
	invariant_value: BOOLEAN
	item: G
	item_tuple: TUPLE [G]
	off: BOOLEAN
	target: CHAIN [G]
	there_exists (test: FUNCTION [G, BOOLEAN]): BOOLEAN
	there_exists_back (test: FUNCTION [G, BOOLEAN]): BOOLEAN

Commands
	back
	continue_for (action: PROCEDURE [G]; n, k: INTEGER_32)
	continue_for_back (action: PROCEDURE [G]; n, k: INTEGER_32)
	continue_search (test: FUNCTION [G, BOOLEAN]; b: BOOLEAN)
	continue_search_back (test: FUNCTION [G, BOOLEAN]; b: BOOLEAN)
	continue_until (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	continue_until_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	continue_while (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	continue_while_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	do_all (action: PROCEDURE [G])
	do_all_back (action: PROCEDURE [G])
	do_for (action: PROCEDURE [G]; i, n, k: INTEGER_32)
	do_for_back (action: PROCEDURE [G]; i, n, k: INTEGER_32)
	do_if (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	do_if_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	do_until (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	do_until_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	do_while (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	do_while_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	finish
	forth
	search (test: FUNCTION [G, BOOLEAN]; b: BOOLEAN)
	search_back (test: FUNCTION [G, BOOLEAN]; b: BOOLEAN)
	set (s: [like target] CHAIN [G])
	start
	until_continue (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	until_continue_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	until_do (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	until_do_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	while_continue (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	while_continue_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	while_do (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])
	while_do_back (action: PROCEDURE [G]; test: FUNCTION [G, BOOLEAN])



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