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boost::proto::is_env — A Boolean metafuntion for determining whether or not a type is a Proto transform environment.
// In header: <boost/proto/transform/env.hpp>
template<typename T>
struct is_env : mpl::bool_<true-or-false> {
};is_env<T> inherits from mpl::true_ under the following
conditions:
T is proto::empty_env.T is a specialization of proto::env<>.T is derived from any of the above.T is a cv-qualified variant of any of the above.T is a reference to any of the above.
Otherwise, is_env<T> inherits from mpl::false_.