Larry Evans wrote:
Me too!
I couldn't tell from your email -- what are you me too-ing?
In general, there should be an n-ary version of all the binary ops.
Do you mean, you'd like to create an expression expr<tag::plus, args4<A,B,C,D> > ? There's nothing stopping you from doing that today. make_expr<tag::plus>(1,2,3,4) The only problem is that default_context won't know what to do with it, but that's not big a problem ... just write your own context.
This should also be extended to the or_ also. I remember having a problem with folding or_ because it was an n-ary op and had to define my own binary or which just forwarded to the or_. That was a "kludge". So maybe define or_ as binary and then define the n-ary version based on this binary.
IIRC, your problem was that or_ requires at least 2 parameters. I had agreed to change that, but haven't yet. -- Eric Niebler Boost Consulting www.boost-consulting.com