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/*
* Copyright Andrey Semashev 2007 - 2014.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
/*!
* \file fallback_policy_fwd.hpp
* \author Andrey Semashev
* \date 18.08.2012
*
* The header contains forward declaration of fallback policies when attribute value visitation or extraction fails.
*/
#ifndef BOOST_LOG_ATTRIBUTES_FALLBACK_POLICY_FWD_HPP_INCLUDED_
#define BOOST_LOG_ATTRIBUTES_FALLBACK_POLICY_FWD_HPP_INCLUDED_
#include <boost/log/detail/config.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
/*!
* The \c fallback_to_none policy results in returning an empty value reference if the attribute value cannot be extracted.
*/
struct fallback_to_none;
/*!
* The \c fallback_to_throw policy results in throwing an exception if the attribute value cannot be extracted.
*/
struct fallback_to_throw;
/*!
* The \c fallback_to_default policy results in a default value if the attribute value cannot be extracted.
*/
template< typename DefaultT >
struct fallback_to_default;
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#endif // BOOST_LOG_ATTRIBUTES_FALLBACK_POLICY_FWD_HPP_INCLUDED_
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