Short Anonymous Functions

[Geoff Leyland <geoff_leyland@...>]

Hi,

I read the wiki page on Short Anonymous Functions ( http://lua-users.org/wiki/ShortAnonymousFunctions 
 ), and noticed that there's nothing there that proposes the approach  
that is (or at least was a few years ago) used in the Boost Lambda  
Library: make special argument placeholder objects (say _1, _2 ..._N),  
and overload the operators for these to return callable objects.

This means you can, for example:

function test(f)
  for i = 1, 10 do
    print(f(i, 20))
  end
end

test(_1 + 100 + _2)

Does anyone have any comments on or interest in such an approach?   
I've attached working proof-of-concept code that only handles  
addition, but clearly you could do much more.

My interest is in writing a binding to Linear Program solvers (CLP in  
the first instance) and I'm fiddling with nice ways of expressing  
constraints.  In this case you have variable placeholders rather than  
argument placeholders, but it's pretty much the same.

Cheers,
Geoff

Attachment: lambda.lua
Description: Binary data