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## basic_trace_output
### Synopsis
Defined in <boost/openmethod/policies/basic_trace_output.hpp>.
```c++
namespace boost::openmethod::policies {
template<class Policy, typename Stream = /*unspecified*/>
struct basic_trace_output : trace {
static bool trace_enabled;
static Stream trace_stream;
};
}
```
### Description
`basic_error_output` is an implementation of `trace` that writes error
messages to a `LightweightOutputStream`.
### Members
#### trace_enabled
```c++
static bool trace_enabled;
```
Set to `true` if environment variable `BOOST_OPENMETHOD_TRACE` is set to `1`.
#### trace_stream
```c++
static Stream trace_stream;
```
Initialized by the default constructor of `Stream`. It is the responsibility of
the program to prepare it for output if needed, e.g., for a `std::ofstream`, to
open it.
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