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boost::proto::result_of::unpack_expr<Tag, Domain, Sequence> — Metafunction that computes the return type of the
            proto::unpack_expr()
            function, within the specified domain.
          
// In header: <boost/proto/make_expr.hpp> template<typename Tag, typename Domain, typename Sequence> struct unpack_expr<Tag, Domain, Sequence> { // types typedef typename proto::result_of::make_expr< Tag, Domain, typename fusion::result_of::value_at_c<S, 0>::type, ... typename fusion::result_of::value_at_c<S,N-1>::type >::type type; // Where S is a RandomAccessSequence equivalent to Sequence, and N is the size of S. };