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## Struct template env

boost::proto::env

## Synopsis

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

    template<typename Key, typename Value, typename Env = proto::empty_env>
    struct env {
      // construct/copy/destruct
      explicit env(Value const &, Env const & = Env());

      // public member functions
      see-below operator[](see-below) const;
    };

## Description

### `env` public construct/copy/destruct

1.     explicit env(Value const & value, Env const & other = Env());

   Parameters: |
   `value` | The value to be associated with the `Key`.
   `other` | Another key/value store.

### `env` public member functions

1.     see-below operator[](see-below) const;

   If called with an object that is implicitly convertible to type `Key`, this function returns the `Value` passed to the constructor. Otherwise, it returns the result of calling `operator[]` on the `Env` passed to the constructor.