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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.
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::value_at<Sequence, 0>::type,
...
typename fusion::value_at<Sequence, N
-1>::type
>::type
type; // Where N is the size of Sequence.
};