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: / proc / self / root / opt / alt / ruby34 / share / ri / system / ObjectSpace / WeakKeyMap /

Filename : getkey-i.ri

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U:RDoc::AnyMethod[iI"getkey:ETI"#ObjectSpace::WeakKeyMap#getkey;TF:publico:RDoc::Markup::Document:@parts[
o:RDoc::Markup::Paragraph;	[I"JReturns the existing equal key if it exists, otherwise returns +nil+.;To:RDoc::Markup::BlankLine�o;
;	[I"LThis might be useful for implementing caches, so that only one copy of ;TI"9some object would be used everywhere in the program:;T@o:RDoc::Markup::Verbatim;	[I"*value = {amount: 1, currency: 'USD'}
;TI"
;TI"-# Now if we put this object in a cache:
;TI")cache = ObjectSpace::WeakKeyMap.new
;TI"cache[value] = true
;TI"
;TI"D# ...we can always extract from there and use the same object:
;TI"7copy = cache.getkey({amount: 1, currency: 'USD'})
;TI"/copy.object_id == value.object_id #=> true;T:@format0:
@fileI"weakmap.c;T:0@omit_headings_from_table_of_contents_below0I",map.getkey(key) -> existing_key or nil
;T0[�I"	(p1);T@FI"WeakKeyMap;TcRDoc::NormalClass00