I thought of Nim, too. To add to your comment, Nim's "Unified Call Syntax" recognises as the same len(x), x.len() and also x.len (this is similar to Ruby's poet

I thought of Nim, too. To add to your comment, Nim's "Unified Call Syntax" recognises as the same len(x), x.len() and also x.len (this is similar to Ruby's poetry mode, if I am not mistaken). I find it cool, but I can also imagine reasons for which the latter would not be appreciated by the C++ community.