Feature #8465: Proc set_binding

• Status: Rejected
• Assignee: -
• Target version: -

[beanstalksurf (Jacob Burkhart)]

=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

[beanstalksurf (Jacob Burkhart)]

Oops, I meant that last line to say:

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

foo blah

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)
• Status changed from Open to Feedback

=begin
Try:

FooFoo.new.instance_exec('blah', &foo_putter)
=end

[ko1 (Koichi Sasada)]

• Status changed from Feedback to Rejected

Difficult to implement.