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boost::proto::_env_var::impl
// In header: <boost/proto/transform/env.hpp> struct impl : proto::transform_impl<Expr, State, Data> > { // types typedef typename proto::result_of::env_var<Data, Key>::type result_type; // public member functions result_type operator()(typename impl::expr_param, typename impl::state_param, typename impl::data_param) const; };
impl public member functionsresult_type operator()(typename impl::expr_param, typename impl::state_param, typename impl::data_param data) const;
                  Fetches the value associated with Key from the transform environment
                  passed in the data (third) parameter.
                
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