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	description: "[
		Facilities for adapting the exception handling mechanism.
		This class may be used as ancestor by classes needing its facilities.
	]"
	status: "See notice at end of class"
	date: "$Date: 2001-11-16 20:32:23 +0000 (Fri, 16 Nov 2001) $"
	revision: "$Revision: 51435 $"

class 
	EXCEPTIONS

feature -- Access

	Check_instruction: INTEGER is 7
			-- Exception code for violated check
			-- (from EXCEP_CONST)

	Class_invariant: INTEGER is 6
			-- Exception code for violated class invariant
			-- (from EXCEP_CONST)

	Com_exception: INTEGER is 28
			-- Exception code for a COM error.
			-- (from EXCEP_CONST)

	Developer_exception: INTEGER is 24
			-- Exception code for developer exception
			-- (from EXCEP_CONST)

	External_exception: INTEGER is 18
			-- Exception code for operating system error
			-- which does not set the errno variable
			-- (Unix-specific)
			-- (from EXCEP_CONST)

	Floating_point_exception: INTEGER is 5
			-- Exception code for floating point exception
			-- (from EXCEP_CONST)

	Incorrect_inspect_value: INTEGER is 9
			-- Exception code for inspect value which is not one
			-- of the inspect constants, if there is no Else_part
			-- (from EXCEP_CONST)

	Io_exception: INTEGER is 21
			-- Exception code for I/O error
			-- (from EXCEP_CONST)

	Loop_invariant: INTEGER is 11
			-- Exception code for violated loop invariant
			-- (from EXCEP_CONST)

	Loop_variant: INTEGER is 10
			-- Exception code for non-decreased loop variant
			-- (from EXCEP_CONST)

	No_more_memory: INTEGER is 2
			-- Exception code for failed memory allocation
			-- (from EXCEP_CONST)

	Operating_system_exception: INTEGER is 22
			-- Exception code for operating system error
			-- which sets the errno variable
			-- (Unix-specific)
			-- (from EXCEP_CONST)

	Postcondition: INTEGER is 4
			-- Exception code for violated postcondition
			-- (from EXCEP_CONST)

	Precondition: INTEGER is 3
			-- Exception code for violated precondition
			-- (from EXCEP_CONST)

	Rescue_exception: INTEGER is 14
			-- Exception code for exception in rescue clause
			-- (from EXCEP_CONST)

	Retrieve_exception: INTEGER is 23
			-- Exception code for retrieval error
			-- may be raised by retrieved in IO_MEDIUM.
			-- (from EXCEP_CONST)

	Routine_failure: INTEGER is 8
			-- Exception code for failed routine
			-- (from EXCEP_CONST)

	Runtime_io_exception: INTEGER is 27
			-- Exception code for I/O error raised by runtime functions
			-- such as store/retrieve, file access...
			-- (from EXCEP_CONST)

	Signal_exception: INTEGER is 12
			-- Exception code for operating system signal
			-- (from EXCEP_CONST)

	Void_assigned_to_expanded: INTEGER is 19
			-- Exception code for assignment of void value
			-- to expanded entity
			-- (from EXCEP_CONST)

	Void_call_target: INTEGER is 1
			-- Exception code for feature applied to void reference
			-- (from EXCEP_CONST)
	
feature -- Status report

	assertion_violation: BOOLEAN is
			-- Is last exception originally due to a violated
			-- assertion or non-decreasing variant?
		do
			Result := (original_exception = check_instruction) or else (original_exception = class_invariant) or else (original_exception = loop_invariant) or else (original_exception = loop_variant) or else (original_exception = postcondition) or else (original_exception = precondition)
		end

	class_name: STRING is
			-- Name of the class that includes the recipient
			-- of original form of last exception
		external
			"C | %"eif_except.h%""
		alias
			"eelclass"
		end

	developer_exception_name: STRING is
			-- Name of last developer-raised exception
		require
			applicable: is_developer_exception
		do
			Result := original_tag_name
		end

	exception: INTEGER is
			-- Code of last exception that occurred
		external
			"C | %"eif_except.h%""
		alias
			"eelcode"
		end

	exception_trace: STRING is
			-- String representation of the exception trace
		external
			"C | %"eif_except.h%""
		alias
			"stack_trace_string"
		end

	is_developer_exception: BOOLEAN is
			-- Is the last exception originally due to
			-- a developer exception?
		do
			Result := (original_exception = developer_exception)
		end

	is_developer_exception_of_name (name: STRING): BOOLEAN is
			-- Is the last exception originally due to a developer
			-- exception of name name?
		do
			Result := is_developer_exception and then equal (name, developer_exception_name)
		end

	is_signal: BOOLEAN is
			-- Is last exception originally due to an external
			-- event (operating system signal)?
		do
			Result := (original_exception = signal_exception)
		end

	is_system_exception: BOOLEAN is
			-- Is last exception originally due to an
			-- external event (operating system error)?
		do
			Result := (original_exception = external_exception) or else (original_exception = operating_system_exception)
		end

	meaning (except: INTEGER): STRING is
			-- A message in English describing what except is
		external
			"C | %"eif_except.h%""
		alias
			"eename"
		end

	original_class_name: STRING is
			-- Name of the class that includes the recipient
			-- of original form of last exception
		external
			"C | %"eif_except.h%""
		alias
			"eeoclass"
		end

	original_exception: INTEGER is
			-- Original code of last exception that triggered
			-- current exception
		external
			"C | %"eif_except.h%""
		alias
			"eeocode"
		end

	original_recipient_name: STRING is
			-- Name of the routine whose execution was
			-- interrupted by original form of last exception
		external
			"C | %"eif_except.h%""
		alias
			"eeorout"
		end

	original_tag_name: STRING is
			-- Assertion tag for original form of last
			-- assertion violation.
		external
			"C | %"eif_except.h%""
		alias
			"eeotag"
		end

	recipient_name: STRING is
			-- Name of the routine whose execution was
			-- interrupted by last exception
		external
			"C | %"eif_except.h%""
		alias
			"eelrout"
		end

	tag_name: STRING is
			-- Tag of last violated assertion clause
		external
			"C | %"eif_except.h%""
		alias
			"eeltag"
		end
	
feature -- Status setting

	catch (code: INTEGER) is
			-- Make sure that any exception of code code will be
			-- caught. This is the default.
		external
			"C | %"eif_except.h%""
		alias
			"eecatch"
		end

	die (code: INTEGER) is
			-- Terminate execution with exit status code,
			-- without triggering an exception.
		external
			"C | %"eif_except.h%""
		alias
			"esdie"
		end

	ignore (code: INTEGER) is
			-- Make sure that any exception of code code will be
			-- ignored. This is not the default.
		external
			"C | %"eif_except.h%""
		alias
			"eeignore"
		end

	message_on_failure is
			-- Print an exception history table
			-- in case of failure.
			-- This is the default.
		do
			c_trace_exception (True)
		end

	new_die (code: INTEGER) is
		obsolete "Use ``die''"
		external
			"C | %"eif_except.h%""
		alias
			"esdie"
		end

	no_message_on_failure is
			-- Do not print an exception history table
			-- in case of failure.
		do
			c_trace_exception (False)
		end

	raise (name: STRING) is
			-- Raise a developer exception of name name.
		local
			str: ANY
		do
			if name /= void then
				str := name.to_c
			end
			exclear
			eraise ($str, developer_exception)
		end
	
feature {NONE} -- Implementation

	c_trace_exception (b: BOOLEAN) is
		external
			"C | %"eif_except.h%""
		alias
			"eetrace"
		end

	eraise (str: POINTER; code: INTEGER) is
			-- Raise an exception
		external
			"C | %"eif_except.h%""
		end

	exclear is
		external
			"C | %"eif_except.h%""
		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 EXCEPTIONS


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