Struct template unpack_expr<Tag, Domain, Sequence>
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.
Synopsis
template<typename Tag, typename Domain, typename Sequence>
struct unpack_expr<Tag, Domain, Sequence> {
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;
};