67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
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/*
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* Copyright Andrey Semashev 2019.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* https://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file utility/manipulators/auto_newline.hpp
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* \author Andrey Semashev
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* \date 23.06.2019
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*
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* The header contains implementation of a stream manipulator for inserting a newline, unless there is already one inserted.
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*/
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#ifndef BOOST_LOG_UTILITY_MANIPULATORS_AUTO_NEWLINE_HPP_INCLUDED_
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#define BOOST_LOG_UTILITY_MANIPULATORS_AUTO_NEWLINE_HPP_INCLUDED_
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#include <boost/log/detail/config.hpp>
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#include <boost/log/utility/formatting_ostream_fwd.hpp>
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#include <boost/log/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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/*!
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* Stream manipulator for inserting a newline character, unless the last character
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* inserted into the stream is already a newline.
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*/
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struct auto_newline_manip {}
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BOOST_INLINE_VARIABLE const auto_newline = {};
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/*!
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* Stream output operator for the \c auto_newline manipulator
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*/
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template< typename CharT, typename TraitsT, typename AllocatorT >
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inline basic_formatting_ostream< CharT, TraitsT, AllocatorT >& operator<< (basic_formatting_ostream< CharT, TraitsT, AllocatorT >& strm, auto_newline_manip)
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{
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typedef basic_formatting_ostream< CharT, TraitsT, AllocatorT > stream_type;
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typedef typename stream_type::char_type char_type;
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typedef typename stream_type::string_type string_type;
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if (BOOST_LIKELY(strm.good()))
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{
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string_type* str = strm.rdbuf()->storage();
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if (BOOST_LIKELY(!!str))
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{
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strm.rdbuf()->pubsync();
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if (str->empty() || *str->rbegin() != static_cast< char_type >('\n'))
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strm.rdbuf()->push_back(static_cast< char_type >('\n'));
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}
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}
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return strm;
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}
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#endif // BOOST_LOG_UTILITY_MANIPULATORS_AUTO_NEWLINE_HPP_INCLUDED_
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