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U:RDoc::AnyMethod[iI"define_finalizer:ETI""ObjectSpace::define_finalizer;TT: publico:RDoc::Markup::Document: @parts[o: RDoc::Markup::Paragraph; [ I"EAdds aProc as a finalizer, to be called after obj ;TI"Cwas destroyed. The object ID of the obj will be passed ;TI"Das an argument to aProc. If aProc is a lambda or ;TI"?method, make sure it can be called with a single argument.;To: RDoc::Markup::BlankLine o;
; [I":The return value is an array [0, aProc].;T@o;
; [ I"JThe two recommended patterns are to either create the finaliser proc ;TI"Lin a non-instance method where it can safely capture the needed state, ;TI"Eor to use a custom callable object that stores the needed state ;TI"&explicitly as instance variables.;T@o:RDoc::Markup::Verbatim; [ I"class Foo
;TI"4 def initialize(data_needed_for_finalization)
;TI"g ObjectSpace.define_finalizer(self, self.class.create_finalizer(data_needed_for_finalization))
;TI" end
;TI"
;TI"? def self.create_finalizer(data_needed_for_finalization)
;TI" proc {
;TI"= puts "finalizing #{data_needed_for_finalization}"
;TI" }
;TI" end
;TI" end
;TI"
;TI"class Bar
;TI" class Remover
;TI"6 def initialize(data_needed_for_finalization)
;TI"H @data_needed_for_finalization = data_needed_for_finalization
;TI"
end
;TI"
;TI" def call(id)
;TI"> puts "finalizing #{@data_needed_for_finalization}"
;TI"
end
;TI" end
;TI"
;TI"4 def initialize(data_needed_for_finalization)
;TI"W ObjectSpace.define_finalizer(self, Remover.new(data_needed_for_finalization))
;TI" end
;TI" end
;T: @format0o;
; [ I"=Note that if your finalizer references the object to be ;TI"Efinalized it will never be run on GC, although it will still be ;TI"Crun at exit. You will get a warning if you capture the object ;TI"6to be finalized as the receiver of the finalizer.;T@o; ; [
I"class CapturesSelf
;TI" def initialize(name)
;TI"3 ObjectSpace.define_finalizer(self, proc {
;TI"5 # this finalizer will only be run on exit
;TI"% puts "finalizing #{name}"
;TI" })
;TI" end
;TI" end
;T;
0o;
; [I"NAlso note that finalization can be unpredictable and is never guaranteed ;TI" to be run except on exit.;T:
@fileI" gc.c;T:0@omit_headings_from_table_of_contents_below0I"5ObjectSpace.define_finalizer(obj, aProc=proc())
;T0[ I"(p1, p2 = v2);T@LFI"ObjectSpace;TcRDoc::NormalModule00