CRAZY: First class namespaces

[Amit Patel]

 Darrell Gallion <darrell at dorb.com> wrote:
| 
| If I now understand you're saying, the function captures a scope from where
| it's defined. Or is given a scope on the fly. So could a function instance
| act like a class to produce new functions, each with it's own dynamic scope?
| Maybe a default var could be twisted to this use.
| 
| def dyn( self=None):
|         self.x=1
| 
| def helper(func):
|     func()
| 
| def test():
|     x=0
|         # use dyn like a class
|     myFunc=dyn(self=locals())
|     helper(myFunc)
|     assert(x==1)

Yeah, a function can create new functions by using scoping.  Here's
the canonical example from Scheme / ML:

  def make_adder(n):
     def adder(m):
        return n+m
     return adder


  add5 = make_adder(5)
  add9 = make_adder(9)

So now add5(3) will be 8, and add9(10) will be 19.  You can do the
same with default vars now, by having adder(m, n=n).

   - Amit

-- 
--
Amit J Patel, Computer Science Department, Stanford University
http://www-cs-students.stanford.edu/~amitp/