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	description: "References to objects meant to be exchanged with non-Eiffel software."
	status: "See notice at end of class"
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

expanded class 
	POINTER

feature -- Access

	hash_code: INTEGER is
			-- Hash code value
			-- (from POINTER_REF)
		do
			Result := (c_hashcode (item)).abs
		ensure -- from HASHABLE
			good_hash_value: Result >= 0
		end

	item: POINTER
			-- Pointer value
			-- (from POINTER_REF)
	
feature -- Status report

	is_hashable: BOOLEAN is
			-- May current object be hashed?
			-- (True if it is not its type's default.)
			-- (from POINTER_REF)
		do
			Result := item /= default_pointer
		ensure -- from HASHABLE
			ok_if_not_default: Result implies (Current /= default)
		end
	
feature -- Element change

	set_item (p: POINTER) is
			-- Make p the item value.
			-- (from POINTER_REF)
		do
			item := p
		end
	
feature {NONE} -- Implementation

	c_hashcode (p: POINTER): INTEGER is
			-- Hash code value of p
			-- (from POINTER_REF)
		external
			"C [macro %"eif_misc.h%"]"
		alias
			"conv_pi"
		end

	c_memcpy (destination, source: POINTER; count: INTEGER) is
			-- C memcpy
			-- (from POINTER_REF)
		external
			"C (void *, const void *, size_t) | <string.h>"
		alias
			"memcpy"
		end

	c_memmove (destination, source: POINTER; count: INTEGER) is
			-- C memmove
			-- (from POINTER_REF)
		external
			"C (void *, const void *, size_t) | <string.h>"
		alias
			"memmove"
		end

	c_memset (source: POINTER; val: INTEGER; count: INTEGER) is
			-- C memset
			-- (from POINTER_REF)
		external
			"C (void *, int, size_t) | <string.h>"
		alias
			"memset"
		end

	c_offset_pointer (p: POINTER; o: INTEGER): POINTER is
			-- Pointer moved by an offset of o bytes from p.
			-- (from POINTER_REF)
		external
			"C [macro %"eif_macros.h%"]"
		alias
			"RTPOF"
		end

	c_outp (p: POINTER): STRING is
			-- Printable representation of pointer value
			-- (from POINTER_REF)
		external
			"C | %"eif_out.h%""
		end
	
feature -- Memory copy

	memory_copy (a_source: POINTER; a_size: INTEGER) is
			-- Copy a_size bytes from a_source to Current.
			-- a_source and Current should not overlap.
			-- (from POINTER_REF)
		require -- from POINTER_REF
			valid_size: a_size >= 0
			valid_source: a_source /= default_pointer
		do
			c_memcpy (item, a_source, a_size)
		end

	memory_move (a_source: POINTER; a_size: INTEGER) is
			-- Copy a_size bytes from a_source to Current.
			-- a_source and Current can overlap.
			-- (from POINTER_REF)
		require -- from POINTER_REF
			valid_size: a_size >= 0
			valid_source: a_source /= default_pointer
		do
			c_memmove (item, a_source, a_size)
		end

	memory_set (val, n: INTEGER) is
			-- Fill first n bytes of the memory pointed by Current
			-- with constant val.
			-- (from POINTER_REF)
		require -- from POINTER_REF
			valid_val: val >= 0
			valid_n: n >= 0
		do
			c_memset (item, val, n)
		end
	
feature -- Operations

	infix "+" (offset: INTEGER): like Current is
			-- Pointer moved by an offset of offset bytes.
			-- (from POINTER_REF)
		do
			create Result
			Result.set_item (c_offset_pointer (item, offset))
		end
	
feature -- Output

	out: STRING is
			-- Printable representation of pointer value
			-- (from POINTER_REF)
		do
			Result := c_outp (item)
		end
	
invariant

		-- from ANY
	reflexive_equality: standard_is_equal (Current)
	reflexive_conformance: conforms_to (Current)

indexing
	library: "[
			EiffelBase: Library of reusable components for Eiffel.
	]"
	status: "[
			Copyright 1986-2001 Interactive Software Engineering (ISE).
			For ISE customers the original versions are an ISE product
			covered by the ISE Eiffel license and support agreements.
	]"
	license: "[
			EiffelBase may now be used by anyone as FREE SOFTWARE to
			develop any product, public-domain or commercial, without
			payment to ISE, under the terms of the ISE Free Eiffel Library
			License (IFELL) at http://eiffel.com/products/base/license.html.
	]"
	source: "[
			Interactive Software Engineering Inc.
			ISE Building
			360 Storke Road, Goleta, CA 93117 USA
			Telephone 805-685-1006, Fax 805-685-6869
			Electronic mail <info@eiffel.com>
			Customer support http://support.eiffel.com
	]"
	info: "[
			For latest info see award-winning pages: http://eiffel.com
	]"

end -- class POINTER


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