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boost::proto::is_aggregate — A Boolean metafunction that indicates whether a type requires aggregate initialization.
// In header: <boost/proto/traits.hpp>
template<typename T> 
struct is_aggregate :  mpl::bool_<true-or-false> {
};
            proto::is_aggregate<> is used by the
            proto::make<> transform to determine how
            to construct an object of some type T, given some initialization arguments
            a0,...an.
            If proto::is_aggregate<T>::value is true,
            then an object of type T will be initialized as
            T t = {a0,...an};.
            Otherwise, it will be initialized as
            T t(a0,...an).
          
            Note: proto::expr<> and
            proto::basic_expr<>are aggregates.