indexing
	description	: "[
					Describes a breakpoint's key. It is by its `body_index' 
				  	and its `breakable_line_number' (line number in stop points view).
				  ]"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	author		: "$Author$"
	date		: "$Date$"
	revision	: "$Revision$"

deferred
class
	BREAKPOINT_KEY_I

inherit
	HASHABLE
		undefine
			is_equal
		end

feature -- Access

	hash_code: INTEGER is
			-- Hash code for breakpoint.
		do
			Result := (body_index |<< 6 | breakable_line_number).hash_code |<< 1
				-- here we handle the case where overflow occurred  (Result > 2147483647)
		end

	routine: E_FEATURE
			-- Feature where this breakpoint is situated.
		deferred
		end

	breakable_line_number: INTEGER
			-- Line number of the breakpoint in the stoppoint view under $EiffelGraphicalCompiler$.
		deferred
		end

	body_index: INTEGER
			-- `body_index' of the feature where this breakpoint is situated
		deferred
		end

invariant

	valid_location: 	routine /= Void and then
						breakable_line_number > 0 and then
						routine.body_index /= 0

indexing
	copyright: "Copyright (c) 1984-2007, 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