Class: Object

Inherits:
BasicObject
Defined in:
lib/object.rb

Instance Method Summary collapse

Instance Method Details

#instance_exec(*args, &block) ⇒ Object

This is an extremely powerful little function that will be built-in to Ruby 1.9. This version is from Mauricio Fernandez via ruby-talk. Works like instance_eval except that you can pass parameters to the block. This means you can define a block intended for use with instance_eval, pass it to another method, which can then invoke with parameters. This is used quite a bit by the Waves::Mapping code.



7
8
9
10
11
12
13
14
15
16
 
# File 'lib/object.rb', line 7

def instance_exec(*args, &block)
  mname = "__instance_exec_#{Thread.current.object_id.abs}"
  class << self; self end.class_eval{ define_method(mname, &block) }
  begin
    ret = send(mname, *args)
  ensure
    class << self; self end.class_eval{ undef_method(mname) } rescue nil
  end
  ret
end