boost/log/utility/manipulators/to_log.hpp

/*
 *          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   to_log.hpp
 * \author Andrey Semashev
 * \date   06.11.2012
 *
 * This header contains the \c to_log output manipulator.
 */
#ifndef BOOST_LOG_UTILITY_MANIPULATORS_TO_LOG_HPP_INCLUDED_
#define BOOST_LOG_UTILITY_MANIPULATORS_TO_LOG_HPP_INCLUDED_
#include <iosfwd>
#include <boost/core/enable_if.hpp>
#include <boost/log/detail/config.hpp>
#include <boost/log/detail/is_ostream.hpp>
#include <boost/log/utility/formatting_ostream_fwd.hpp>
#include <boost/log/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
/*!
 * \brief Generic manipulator for customizing output to log
 */
template< typename T, typename TagT = void >
class to_log_manip
{
public:
    //! Output value type
    typedef T value_type;
    //! Value tag type
    typedef TagT tag_type;
private:
    //! Reference to the value
    value_type const& m_value;
public:
    explicit to_log_manip(value_type const& value) BOOST_NOEXCEPT : m_value(value) {}
    to_log_manip(to_log_manip const& that) BOOST_NOEXCEPT : m_value(that.m_value) {}
    value_type const& get() const BOOST_NOEXCEPT { return m_value; }
};
template< typename StreamT, typename T, typename TagT >
inline typename enable_if_c< log::aux::is_ostream< StreamT >::value, StreamT& >::type operator<< (StreamT& strm, to_log_manip< T, TagT > manip)
{
    strm << manip.get();
    return strm;
}
template< typename T >
inline to_log_manip< T > to_log(T const& value) BOOST_NOEXCEPT
{
    return to_log_manip< T >(value);
}
template< typename TagT, typename T >
inline to_log_manip< T, TagT > to_log(T const& value) BOOST_NOEXCEPT
{
    return to_log_manip< T, TagT >(value);
}
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_UTILITY_MANIPULATORS_TO_LOG_HPP_INCLUDED_