AMDG Markus Werle wrote:
Steven Watanabe <watanabesj <at> gmail.com> writes:
If you want to iterate over all the terms in a transform use fold_tree. I don't see any benefit of flattening the expression, besides making things harder for proto :)
We are talking about a general purpose ET library here. There are n-ary operators and function calls in the RealWorld. So these _must_ be first class citizens in proto.
Of course. But that doesn't mean that a + b + c + d + e + f + g has to hold all the elements a to f directly.
Having (a+b+c+d) represented has expr<sum, etc.> is crucial for what I want to do with proto, namely compile-time analytic differentiation in conjunction with expression simplification.
I'm afraid that I still don't understand why creating a flattened view when you process it doesn't work. If this still bothers you, think of it as a cons list instead of a tree. In Christ, Steven Watanabe