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Feature #15327

closed

Proposal: Enable refinements to `#respond_to?`

Added by osyo (manga osyo) about 6 years ago. Updated almost 6 years ago.

Status:
Closed
Assignee:
-
Target version:
-
[ruby-core:89922]

Description

Refinements are enabled with various contexts and methods.

  • #send
  • #__send__
  • Symbol#to_proc
  • #to_s
    • called by "#{hoge}"
  • #to_proc
    • call to &:hoge
    • since ruby 2.6

I want to enable refinements for #respond_to?
I want to use it in the following case.

module StringEx
	refine String do
		def twice
			self + self
		end
	end
end

class X
	using StringEx

	def meth a
		a.twice if a.respond_to? :twice
	end
end

class Y
	def twice
		42 + 42
	end
end

x = X.new

p x.meth Y.new
# => 84

p x.meth "homu"
# => "homuhomu"

p x.meth 42
# nil

pull request : https://github.com/ruby/ruby/pull/2020

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