## output

### Synopsis

Defined in <boost/openmethod/policies/basic_policy.hpp>.

```c++
namespace boost::openmethod::policies {

struct output : policy {};

} // boost::openmethod::policies
```

### Description

`output` is a policy that provides a stream for writing error messages.

### Requirements

#### error_stream

```c++
static LightweightOutputStream error_stream;
```

A static variable that satisfies the requirements of `LightweightOutputStream`.