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Header <boost/proto/transform/env.hpp>


BOOST_PROTO_DEFINE_ENV_VAR(Type, Name)
namespace boost {
  namespace proto {
    struct key_not_found;
    struct empty_env;
    template<typename Key, typename Value, typename Env = proto::empty_env> 
      struct env;
    template<typename T> struct is_env;
    struct data_type;

    proto::data_type const data;

    template<typename Key> struct _env_var;
    struct _env;
    template<typename T> 
      typename proto::result_of::as_env<T &>::type as_env(T &);
    template<typename T> 
      typename proto::result_of::as_env<T const &>::type as_env(T const &);
    template<typename Key, typename Env> 
      typename proto::result_of::has_env_var<Env &, Key>::type 
      has_env_var(Env &);
    template<typename Key, typename Env> 
      typename proto::result_of::has_env_var<Env const &, Key>::type 
      has_env_var(Env const &);
    template<typename Key, typename Env> 
      typename proto::result_of::env_var<Env &, Key>::type env_var(Env &);
    template<typename Key, typename Env> 
      typename proto::result_of::env_var<Env const &, Key>::type 
      env_var(Env const &);
    template<typename Env, typename Key, typename Value> 
      proto::env<Key, Value, UNCVREF(typename proto::result_of::as_env<Env &>::type)> 
      operator,(Env &, proto::env<Key, Value> const &);
    template<typename Env, typename Key, typename Value> 
      proto::env<Key, Value, UNCVREF(typename proto::result_of::as_env<Env const &>::type)> 
      operator,(Env const &, proto::env<Key, Value> const &);
    namespace functional {
      struct as_env;
      template<typename Key> struct has_env_var;
      template<typename Key> struct env_var;
    }
    namespace result_of {
      template<typename T> struct as_env;
      template<typename Env, typename Key> struct has_env_var;
      template<typename Env, typename Key> struct env_var;
    }
  }
}

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