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/*
* Copyright Andrey Semashev 2007 - 2015.
* 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 value_extraction_fwd.hpp
* \author Andrey Semashev
* \date 01.03.2008
*
* The header contains forward declaration of tools for extracting attribute values
* from the view.
*/
#ifndef BOOST_LOG_ATTRIBUTES_VALUE_EXTRACTION_FWD_HPP_INCLUDED_
#define BOOST_LOG_ATTRIBUTES_VALUE_EXTRACTION_FWD_HPP_INCLUDED_
#include <boost/log/detail/config.hpp>
#include <boost/log/attributes/fallback_policy_fwd.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace result_of {
/*!
* \brief A metafunction that allows to acquire the result of the value extraction
*/
template< typename T, typename DefaultT = T, typename TagT = void >
struct extract_or_default;
/*!
* \brief A metafunction that allows to acquire the result of the value extraction
*/
template< typename T, typename TagT = void >
struct extract_or_throw;
/*!
* \brief A metafunction that allows to acquire the result of the value extraction
*/
template< typename T, typename TagT = void >
struct extract;
} // namespace result_of
/*!
* \brief Generic attribute value extractor
*/
template< typename T, typename FallbackPolicyT = fallback_to_none, typename TagT = void >
class value_extractor;
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#endif // BOOST_LOG_ATTRIBUTES_VALUE_EXTRACTION_FWD_HPP_INCLUDED_
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