## default_error_handler

### Synopsis

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

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

template<class Policy>
class default_error_handler : public error_handler {
  public:
    using error_variant = std::variant<
        openmethod_error, not_implemented_error, unknown_class_error,
        hash_search_error, type_mismatch_error, static_slot_error,
        static_stride_error>;
    using function_type = std::function<void(const error_variant& error)>;

    template<class Error>
    static auto error(const Error& error) -> void;
    static auto set_error_handler(error_handler_type handler) -> function_type;
};

}
```

### Description

`default_error_handler` is an implementation of `error_handler` that calls a
`std::function` to handle the error.

### Members

#### error

```c++
template<class Error>
static auto error(const Error& error) -> void;
```

Calls the function last set via `set_error_handler` or, if it was never called,
and if _Policy_ contains an `output` policy, use it to print a description
of `error`.

#### error

```c++
static auto set_error_handler(function_type handler) -> function_type;
```

Sets `handler` as the function to call in case of error.