Struct template env

Struct template env_var

boost::proto::result_of::env_var — Metafunction for computing the return type of proto::env_var().

Synopsis

// In header: <boost/proto/transform/env.hpp>

template<typename Env, typename Key> 
struct env_var :  boost::result_of<proto::functional::env_var<Key>(Env)> {
};