    indexing
    	description: "[
    		Constants used for exception handling.
    		This class may be used as ancestor by classes needing its facilities.
    	]"
    	legal: "See notice at end of class."
    	status: "See notice at end of class."
    	date: "$Date: 2006-07-27 01:26:01 -0700 (Thu, 27 Jul 2006) $"
    	revision: "$Revision: 61676 $"

    class interface
    	EXCEP_CONST

    create
    	default_create
    			-- Process instances of classes with no creation clause.
    			-- (Default: do nothing.)
    			-- (from ANY)

    feature -- Access

    	check_instruction: INTEGER_32 is 7
    			-- Exception code for violated check

    	class_invariant: INTEGER_32 is 6
    			-- Exception code for violated class invariant

    	com_exception: INTEGER_32 is 28
    			-- Exception code for a COM error.

    	create_on_deferred: INTEGER_32 is 17
    			-- Create on deferred

    	developer_exception: INTEGER_32 is 24
    			-- Exception code for developer exception

    	dollar_applied_to_melted_feature: INTEGER_32 is 26
    			-- $ applied to melted feature

    	eiffel_runtime_fatal_error: INTEGER_32 is 25
    			-- Eiffel run-time fatal error

    	eiffel_runtime_panic: INTEGER_32 is 13
    			-- Eiffel run-time panic

    	exception_in_signal_handler: INTEGER_32 is 20
    			-- Exception in signal handler

    	external_exception: INTEGER_32 is 18
    			-- Exception code for operating system error
    			-- which does not set the `errno' variable
    			-- (Unix-specific)

    	floating_point_exception: INTEGER_32 is 5
    			-- Exception code for floating point exception

    	generating_type: STRING_8
    			-- Name of current object's generating type
    			-- (type of which it is a direct instance)
    			-- (from ANY)

    	generator: STRING_8
    			-- Name of current object's generating class
    			-- (base class of the type of which it is a direct instance)
    			-- (from ANY)

    	incorrect_inspect_value: INTEGER_32 is 9
    			-- Exception code for inspect value which is not one
    			-- of the inspect constants, if there is no Else_part

    	io_exception: INTEGER_32 is 21
    			-- Exception code for I/O error

    	loop_invariant: INTEGER_32 is 11
    			-- Exception code for violated loop invariant

    	loop_variant: INTEGER_32 is 10
    			-- Exception code for non-decreased loop variant

    	no_more_memory: INTEGER_32 is 2
    			-- Exception code for failed memory allocation

    	number_of_codes: INTEGER_32 is 29
    			-- How many codes are there to represent exceptions?

    	operating_system_exception: INTEGER_32 is 22
    			-- Exception code for operating system error
    			-- which sets the `errno' variable
    			-- (Unix-specific)

    	out_of_memory: INTEGER_32 is 15
    			-- Out of memory (cannot be ignored)

    	postcondition: INTEGER_32 is 4
    			-- Exception code for violated postcondition

    	precondition: INTEGER_32 is 3
    			-- Exception code for violated precondition

    	rescue_exception: INTEGER_32 is 14
    			-- Exception code for exception in rescue clause

    	resumption_failed: INTEGER_32 is 16
    			-- Resumption failed (retry did not succeed)

    	retrieve_exception: INTEGER_32 is 23
    			-- Exception code for retrieval error
    			-- may be raised by `retrieved' in `IO_MEDIUM'.

    	routine_failure: INTEGER_32 is 8
    			-- Exception code for failed routine

    	runtime_check_exception: INTEGER_32 is 29
    			-- Exception code for runtime check being violated.

    	runtime_io_exception: INTEGER_32 is 27
    			-- Exception code for I/O error raised by runtime functions
    			-- such as store/retrieve, file access...

    	signal_exception: INTEGER_32 is 12
    			-- Exception code for operating system signal

    	valid_code (c: INTEGER_32): BOOLEAN
    			-- Is `c' a valid code to represent some kind of exceptions?

    	void_assigned_to_expanded: INTEGER_32 is 19
    			-- Exception code for assignment of void value
    			-- to expanded entity

    	void_call_target: INTEGER_32 is 1
    			-- Exception code for feature applied to void reference

    feature -- Comparison

    	frozen deep_equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void
    			-- or attached to isomorphic object structures?
    			-- (from ANY)
    		ensure -- from ANY
    			shallow_implies_deep: standard_equal (some, other) implies Result
    			both_or_none_void: (some = Void) implies (Result = (other = Void))
    			same_type: (Result and (some /= Void)) implies some.same_type (other)
    			symmetric: Result implies deep_equal (other, some)

    	frozen equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void or attached
    			-- to objects considered equal?
    			-- (from ANY)
    		ensure -- from ANY
    			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.is_equal (other))

    	is_equal (other: like Current): BOOLEAN
    			-- Is `other' attached to an object considered
    			-- equal to current object?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			symmetric: Result implies other.is_equal (Current)
    			consistent: standard_is_equal (other) implies Result

    	frozen standard_equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void or attached to
    			-- field-by-field identical objects of the same type?
    			-- Always uses default object comparison criterion.
    			-- (from ANY)
    		ensure -- from ANY
    			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.standard_is_equal (other))

    	frozen standard_is_equal (other: like Current): BOOLEAN
    			-- Is `other' attached to an object of the same type
    			-- as current object, and field-by-field identical to it?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			same_type: Result implies same_type (other)
    			symmetric: Result implies other.standard_is_equal (Current)

    feature -- Status report

    	conforms_to (other: ANY): BOOLEAN
    			-- Does type of current object conform to type
    			-- of `other' (as per Eiffel: The Language, chapter 13)?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void

    	same_type (other: ANY): BOOLEAN
    			-- Is type of current object identical to type of `other'?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			definition: Result = (conforms_to (other) and other.conforms_to (Current))

    feature -- Duplication

    	copy (other: like Current)
    			-- Update current object using fields of object attached
    			-- to `other', so as to yield equal objects.
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    			type_identity: same_type (other)
    		ensure -- from ANY
    			is_equal: is_equal (other)

    	frozen deep_copy (other: like Current)
    			-- Effect equivalent to that of:
    			--		copy (`other' . deep_twin)
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			deep_equal: deep_equal (Current, other)

    	frozen deep_twin: like Current
    			-- New object structure recursively duplicated from Current.
    			-- (from ANY)
    		ensure -- from ANY
    			deep_equal: deep_equal (Current, Result)

    	frozen standard_copy (other: like Current)
    			-- Copy every field of `other' onto corresponding field
    			-- of current object.
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    			type_identity: same_type (other)
    		ensure -- from ANY
    			is_standard_equal: standard_is_equal (other)

    	frozen standard_twin: like Current
    			-- New object field-by-field identical to `other'.
    			-- Always uses default copying semantics.
    			-- (from ANY)
    		ensure -- from ANY
    			standard_twin_not_void: Result /= Void
    			equal: standard_equal (Result, Current)

    	frozen twin: like Current
    			-- New object equal to `Current'
    			-- twin calls copy; to change copying/twining semantics, redefine copy.
    			-- (from ANY)
    		ensure -- from ANY
    			twin_not_void: Result /= Void
    			is_equal: Result.is_equal (Current)

    feature -- Basic operations

    	frozen default: like Current
    			-- Default value of object's type
    			-- (from ANY)

    	frozen default_pointer: POINTER
    			-- Default value of type `POINTER'
    			-- (Avoid the need to write `p'.default for
    			-- some `p' of type `POINTER'.)
    			-- (from ANY)

    	default_rescue
    			-- Process exception for routines with no Rescue clause.
    			-- (Default: do nothing.)
    			-- (from ANY)

    	frozen do_nothing
    			-- Execute a null action.
    			-- (from ANY)

    feature -- Output

    	io: STD_FILES
    			-- Handle to standard file setup
    			-- (from ANY)

    	out: STRING_8
    			-- New string containing terse printable representation
    			-- of current object
    			-- Was declared in ANY as synonym of tagged_out.
    			-- (from ANY)

    	print (some: ANY)
    			-- Write terse external representation of `some'
    			-- on standard output.
    			-- (from ANY)

    	frozen tagged_out: STRING_8
    			-- New string containing terse printable representation
    			-- of current object
    			-- Was declared in ANY as synonym of out.
    			-- (from ANY)

    feature -- Platform

    	operating_environment: OPERATING_ENVIRONMENT
    			-- Objects available from the operating system
    			-- (from ANY)

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

    indexing
    	library: "EiffelBase: Library of reusable components for Eiffel."
    	copyright: "Copyright (c) 1984-2006, Eiffel Software and others"
    	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
    	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 -- class EXCEP_CONST