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: / proc / self / root / opt / alt / ruby34 / share / ri / system / ObjectSpace / WeakMap /
Filename : cdesc-WeakMap.ri
back
U:RDoc::NormalClass[iI"WeakMap:ETI"ObjectSpace::WeakMap;TI"Object;To:RDoc::Markup::Document:@parts[o;;[
o:RDoc::Markup::Paragraph;[I"KAn ObjectSpace::WeakMap is a key-value map that holds weak references ;TI"Mto its keys and values, so they can be garbage-collected when there are ;TI"no more references left.;To:RDoc::Markup::BlankLine�o;	;[I".Keys in the map are compared by identity.;T@o:RDoc::Markup::Verbatim;[I""m = ObjectSpace::WeakMap.new
;TI"key1 = "foo"
;TI"val1 = Object.new
;TI"m[key1] = val1
;TI"
;TI"key2 = "bar"
;TI"val2 = Object.new
;TI"m[key2] = val2
;TI"
;TI""m[key1] #=> #<Object:0x0...>
;TI""m[key2] #=> #<Object:0x0...>
;TI"
;TI"6val1 = nil # remove the other reference to value
;TI"GC.start
;TI"
;TI"m[key1] #=> nil
;TI"m.keys #=> ["bar"]
;TI"
;TI"4key2 = nil # remove the other reference to key
;TI"GC.start
;TI"
;TI"m[key2] #=> nil
;TI"m.keys #=> []
;T:@format0o;	;[I"R(Note that GC.start is used here only for demonstrational purposes and might ;TI".not always lead to demonstrated results.);T@o;	;[I"OSee also ObjectSpace::WeakKeyMap map class, which compares keys by value, ;TI"0and holds weak references only to the keys.;T:
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0;0[I"ext/objspace/objspace.c;TI"ObjectSpace;TcRDoc::NormalModule