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### Header <boost/proto/transform/fold_tree.hpp>

Contains definition of the `proto::fold_tree<>` and `proto::reverse_fold_tree<>` transforms.

    namespace boost {
      namespace proto {
        template<typename Sequence, typename State0, typename Fun> struct fold_tree;
        template<typename Sequence, typename State0, typename Fun>
          struct reverse_fold_tree;
      }
    }