Feature #5360

BasicObject#binding

Added by Thomas Sawyer over 2 years ago. Updated over 1 year ago.

[ruby-core:39690]
Status:Feedback
Priority:Normal
Assignee:-
Category:core
Target version:next minor

Description

For meta-programming purposes I think there needs to be a way to get a BasicObject's binding.

History

#1 Updated by Nobuyoshi Nakada over 2 years ago

  • Status changed from Open to Feedback

Can you elaborate?

#2 Updated by Thomas Sawyer over 2 years ago

Sure. I think the most obvious usecase is with ERB. If I want to strictly control the available interface to an ERB template a subclass of BasicObject is an ideal way to do. But ERB's result method takes a binding. So that's one specific case I've come across, and I am certain there are others given that both BasicObject and binding are very useful devices in the context of meta-programming.

#3 Updated by George Koehler over 2 years ago

I can get a Binding from a BasicObject like so:

class Cow < BasicObject
Moo = "Moooo!"
def binding
::Kernel.binding
end
end

b = Cow.new.binding
p eval("Moo", b) # => "Moooo!"
p eval("String", b) # raises NameError

This uses the syntax "::Kernel" to access a global constant.

#4 Updated by Thomas Sawyer over 2 years ago

On Sep 27, 3:51 pm, George Koehler xkern...@netscape.net wrote:

Issue #5360 has been updated by George Koehler.

I can get a Binding from a BasicObject like so:

 class Cow < BasicObject
   Moo

#5 Updated by Yusuke Endoh over 1 year ago

  • Target version set to next minor

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