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@kdmsnr
Created January 29, 2015 05:35
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metaprogramming ruby sample code: using.rb
module Kernel
def using(resource)
begin
yield
ensure
resource.dispose
end
end
def using2(resource)
begin
yield
ensure
resource.dispose
end
end
end
class Resource
def dispose
@disposed = true
end
def disposed?
@disposed
end
end
r = Resource.new
# using(r){raise}
#=> wrong argument type Resource (expected Module) (TypeError)
# using2(r){raise}
#=> `block in <main>': unhandled exception
@kdmsnr
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kdmsnr commented Jan 29, 2015

なんで wrong argument type Resource (expected Module) (TypeError) になるんだろう。
1.9だと大丈夫で、2.xだとおかしい、みたいな?

@kdmsnr
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kdmsnr commented Jan 29, 2015

あ、refinementsか

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