indexing
	description: "Bit operations on integer (or, and not)."
	status: "See notice at end of class."
	date: "$Date$"
	revision: "$Revision$"

class
	WEL_BIT_OPERATIONS

feature -- Basic operations

	set_flag (flags, mask: INTEGER): INTEGER is
			-- Set the `mask' in `flags'
		do
			Result := c_set_flag (flags, mask)
		ensure
			flag_set: flag_set (Result, mask)
		end

	clear_flag (flags, mask: INTEGER): INTEGER is
			-- Clear the `mask' in `flags'
		do
			Result := c_clear_flag (flags, mask)
		ensure
			flag_unset: not flag_set (Result, mask)
		end

feature -- Status report

	flag_set (flags, mask: INTEGER): BOOLEAN is
			-- Is `mask' set in `flags'?
		do
			Result := c_flag_set (flags, mask)
		end

feature {NONE} -- Externals

	c_set_flag (flags, mask: INTEGER): INTEGER is
		external
			"C [macro <wel.h>]"
		end

	c_clear_flag (flags, mask: INTEGER): INTEGER is
		external
			"C [macro <wel.h>]"
		end

	c_flag_set (flags, mask: INTEGER): BOOLEAN is
		external
			"C [macro <wel.h>]"
		end

end -- class WEL_BIT_OPERATIONS


--|----------------------------------------------------------------
--| Windows Eiffel Library: library of reusable components for ISE Eiffel.
--| Copyright (C) 1986-2001 Interactive Software Engineering Inc.
--| All rights reserved. Duplication and distribution prohibited.
--| May be used only with ISE Eiffel, under terms of user license. 
--| Contact ISE for any other use.
--|
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--| ISE Building
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--| Electronic mail <info@eiffel.com>
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--| For latest info see award-winning pages: http://www.eiffel.com
--|----------------------------------------------------------------