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  1. # Rubyのclassってdupできたんだ…。
  2.  
  3. class Foo
  4.   def hoge
  5.     "HOGE"
  6.   end
  7. end
  8.  
  9. foo_dup = Foo.dup
  10. foo_dup.instance_eval{ define_method(:piyo){ "PIYO" } }
  11.  
  12. p foo_dup.new.hoge
  13. p Foo.new.hoge
  14. p foo_dup.new.piyo # これはOK。あとでdefine_methodしてる
  15. p Foo.new.piyo     # これは例外。もとのFooにはpiyoが定義されていない
  16.  
Runtime error #stdin #stdout #stderr 0.01s 7412KB
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stdin
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Standard input is empty
stdout
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"HOGE"
"HOGE"
"PIYO"
stderr
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prog.rb:15:in `<main>': undefined method `piyo' for #<Foo:0x8415624> (NoMethodError)
https://ideone.com/5SjbIk
Rubyのclassってdupできたんだ…。
language:
Ruby (ruby 2.5.5)
created:
10 years ago
visibility:
secret

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