[ruby-core:56485] [ruby-trunk - Feature #8465][Rejected] Proc set_binding

Issue #8465 has been updated by ko1 (Koichi Sasada).

Status changed from Feedback to Rejected

Difficult to implement.
----------------------------------------
Feature #8465: Proc set_binding
https://bugs.ruby-lang.org/issues/8465#change-41033

Author: beanstalksurf (Jacob Burkhart)
Status: Rejected
Priority: Normal
Assignee: 
Category: 
Target version: 


=begin
(({instance_eval})) is a solution to evaluate a proc in the binding of another object

but it is not a solution for a (({Proc})) that takes arguments

I propose that in order to suppor this use-case we need (({Proc#set_binding}))

Example:


  class BarFoo
    def foo(arg)
      "bar #{arg}"
    end
    def puts_a_foo
      Proc.new do |arg|
        puts self.foo(arg)
      end
    end
  end

  class FooFoo
    def foo(arg)
      "foo #{arg}"
    end
    def foo_foo_proc
      Proc.new{}
    end
  end

  foo_putter = BarFoo.new.puts_a_foo

  foo_putter.call("blah")
  # bar blah

  FooFoo.new.instance_eval(&foo_putter)
  #foo #<FooFoo:0x007ff0b903f9b0>

  foo_putter.binding.eval("puts self.foo('blah')")
  # bar blah

  FooFoo.new.foo_foo_proc.binding.eval("puts self.foo('blah')")
  # foo blah

  #I expect...
  foo_putter.set_binding(FooFoo.new.foo_foo_proc.binding)
  foo_putter.call("blah")
  #to output:
  # foo blah
=end



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