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boost::proto::flatten — A function that returns a "flattened" view of a Proto expression tree.
// In header: <boost/proto/fusion.hpp> template<typename Expr> typename proto::result_of::flatten< Expr >::type const flatten(Expr & expr); template<typename Expr> typename proto::result_of::flatten< Expr const >::type const flatten(Expr const & expr);
            For a tree with a top-most node tag of type T, the elements
            of the flattened sequence are determined by recursing into each child node with the same tag
            type and returning those nodes of different type. So for instance, the Proto expression tree
            corresponding to the expression a | b | c has a flattened
            view with elements [a, b, c], even though the tree is grouped as
            ((a | b) | c).
          
The returned view is a Fusion Forward Sequence.