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boost::proto::is_domain
// In header: <boost/proto/domain.hpp>
template<typename T> 
struct is_domain :  mpl::bool_< true-or-false > {
};
            A metafunction that returns mpl::true_ if the type
            T is the type of a Proto domain;
            mpl::false_ otherwise. If T
            inherits from proto::domain<>,
            is_domain<T> is mpl::true_.