Feature #5360: BasicObject#binding

• Status: Feedback
• Assignee: -
• Target version: -

[trans (Thomas Sawyer)]

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

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Feedback

Can you elaborate?

[trans (Thomas Sawyer)]

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.

[kernigh (George Koehler)]

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.

[trans (Thomas Sawyer)]

On Sep 27, 3:51 pm, George Koehler [e-mail] wrote:

Issue #5360 has been updated by George Koehler.

I can get a Binding from a BasicObject like so:

 class Cow < BasicObject
   Moo

[mame (Yusuke Endoh)]

• Target version set to 2.6

[naruse (Yui NARUSE)]

• Target version deleted (2.6)