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## Struct template result

boost::proto::functional::has_env_var::result

## Synopsis

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

    template<typename Sig>
    struct result {
      // types
      typedef see-below type;
    };

## Description

Encodes the return type of `proto::functional::has_env_var::operator()`. The presence of this member template makes `proto::functional::has_env_var` a valid TR1-style function object type usable with `boost::result_of<>`.

### `result` public types

1. typedef `see-below` type;

   See `proto::functional::has_env_var::operator()`.