indexing
	legal: "See notice at end of class."
	status: "See notice at end of class."
class UN_OLD_B

inherit

	UNARY_B
		redefine
			type, enlarged,
			is_unsafe, optimized_byte_node,
			pre_inlined_code, inlined_byte_code
		end;

feature -- Visitor

	process (v: BYTE_NODE_VISITOR) is
			-- Process current element.
		do
			v.process_un_old_b (Current)
		end

feature

	position: INTEGER;
			-- Position of old in local declaration.
			--| The old expression will be held in the local
			--| registers of the interpreter, that is, the old
			--| old expression value will be stored in local
			--| according to `position'. So when the old expression
			--! will be interpretered, the interpreter will retrieve
			--| the value from the local register.

	set_position (i: INTEGER) is
			-- Assign `i' to position
		do
			position := i
		end;

	type: TYPE_I is
			-- Type of the expression
		do
			Result := expr.type;
		end; -- type

	enlarged: UN_OLD_BL is
		require else
			valid_old_exprs: Context.byte_code.old_expressions /= Void
		local
			old_expr: LINKED_LIST [UN_OLD_B]
		do
			create Result;
			Result.set_expr (expr.enlarged);
			old_expr := Context.byte_code.old_expressions;
			old_expr.extend (Result);
		end;

feature -- Array optimization

	is_unsafe: BOOLEAN is
		do
			Result := expr.is_unsafe
		end

	optimized_byte_node: like Current is
		do
			Result := Current
			expr := expr.optimized_byte_node
		end

feature -- Inlining

	pre_inlined_code: like Current is
		do
			Result := Current
			expr ?= expr.pre_inlined_code
		end

	inlined_byte_code: like Current is
		do
			Result := Current
			expr := expr.inlined_byte_code
		end

indexing
	copyright:	"Copyright (c) 1984-2006, Eiffel Software"
	license:	"GPL version 2 (see http://www.eiffel.com/licensing/gpl.txt)"
	licensing_options:	"http://www.eiffel.com/licensing"
	copying: "[
			This file is part of Eiffel Software's Eiffel Development Environment.
			
			Eiffel Software's Eiffel Development Environment is free
			software; you can redistribute it and/or modify it under
			the terms of the GNU General Public License as published
			by the Free Software Foundation, version 2 of the License
			(available at the URL listed under "license" above).
			
			Eiffel Software's Eiffel Development Environment is
			distributed in the hope that it will be useful,	but
			WITHOUT ANY WARRANTY; without even the implied warranty
			of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
			See the	GNU General Public License for more details.
			
			You should have received a copy of the GNU General Public
			License along with Eiffel Software's Eiffel Development
			Environment; if not, write to the Free Software Foundation,
			Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
		]"
	source: "[
			 Eiffel Software
			 356 Storke Road, Goleta, CA 93117 USA
			 Telephone 805-685-1006, Fax 805-685-6869
			 Website http://www.eiffel.com
			 Customer support http://support.eiffel.com
		]"

end