Re-binding Proc

[Phrogz]

Is there a way to call a proc while passing in the binding/scope for
'self'? I found an un-responded-to question on this (ruby-talk:12794)
in 2001 which implies that, at least then, there was no way to do it.

What I'm doing:
class Foo
@@handlers = {}

def self.handle_type( type, &proc )
@@handlers[ type ] = proc
end

attr_reader :name
def initialize( name )
@name = name
end

def do_thing( type )
@@handlers[ type ].call( self )
end
end

Foo.handle_type( :showname ){ |me|
puts "My name is '#{me.name}'"
}

f = Foo.new( 'f' )
f.do_thing( :showname )
#=> My name is 'f'


What I'd like to do instead:

Foo.handle_type( :showname ){
puts "My name is '#{self.name}'"
}

 

[Phrogz]

Damn, hit send too soon. **continues**

I realize that I can do this by defining a method (as below), but for
some reason that feels bad to me. I'd like to do it with Proc objects,
if possible.

# Works by spamming the method namespace.
class Foo
def self.handle_type( type, &proc )
define_method( "dothing_#{type}", &proc )
end
# ...
def do_thing( type )
send "dothing_#{type}"
end
end

 

[Eero Saynatkari]

Is there a way to call a proc while passing in the binding/scope for
'self'? I found an un-responded-to question on this (ruby-talk:12794)
in 2001 which implies that, at least then, there was no way to do it.

I may be just feeling light-headed from COBOL, but
would #instance_eval not work here?

What I'm doing:
class Foo
@@handlers = {}

def self.handle_type( type, &proc )
@@handlers[ type ] = proc
end

attr_reader :name
def initialize( name )
@name = name
end

def do_thing( type )
@@handlers[ type ].call( self )

instance_eval &@@handlers[type]

end
end

Foo.handle_type( :showname ){ |me|
puts "My name is '#{me.name}'"
}

Foo.handle_typeshowname) {puts "My name is #{self.name}"}