Daniel Dickison danieldickison
danieldickison
/ attr_weak_callback.rb
Created
December 13, 2013 17:42
Quick RubyMotion util to define proc callbacks that only keep a weak reference to the creator of the block/proc using the new Proc#weak! method.
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| module Kernel | |
| def attr_weak_callback(*syms) | |
| syms.each do |sym| | |
| ivar_name = "@#{sym}".to_sym | |
| define_method(sym) do |&block| | |
| if block | |
| instance_variable_set(ivar_name, block.weak!) | |
| else | |
| instance_variable_get(ivar_name) |