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1 | /* |
2 | * Copyright Andrey Semashev 2019. | |
3 | * Distributed under the Boost Software License, Version 1.0. | |
4 | * (See accompanying file LICENSE_1_0.txt or copy at | |
5 | * https://www.boost.org/LICENSE_1_0.txt) | |
6 | */ | |
7 | /*! | |
8 | * \file utility/manipulators/auto_newline.hpp | |
9 | * \author Andrey Semashev | |
10 | * \date 23.06.2019 | |
11 | * | |
12 | * The header contains implementation of a stream manipulator for inserting a newline, unless there is already one inserted. | |
13 | */ | |
14 | ||
15 | #ifndef BOOST_LOG_UTILITY_MANIPULATORS_AUTO_NEWLINE_HPP_INCLUDED_ | |
16 | #define BOOST_LOG_UTILITY_MANIPULATORS_AUTO_NEWLINE_HPP_INCLUDED_ | |
17 | ||
18 | #include <boost/log/detail/config.hpp> | |
19 | #include <boost/log/utility/formatting_ostream_fwd.hpp> | |
20 | #include <boost/log/detail/header.hpp> | |
21 | ||
22 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
23 | #pragma once | |
24 | #endif | |
25 | ||
26 | namespace boost { | |
27 | ||
28 | BOOST_LOG_OPEN_NAMESPACE | |
29 | ||
30 | /*! | |
31 | * Stream manipulator for inserting a newline character, unless the last character | |
32 | * inserted into the stream is already a newline. | |
33 | */ | |
34 | struct auto_newline_manip {} | |
20effc67 | 35 | BOOST_INLINE_VARIABLE const auto_newline = {}; |
92f5a8d4 TL |
36 | |
37 | /*! | |
38 | * Stream output operator for the \c auto_newline manipulator | |
39 | */ | |
40 | template< typename CharT, typename TraitsT, typename AllocatorT > | |
41 | inline basic_formatting_ostream< CharT, TraitsT, AllocatorT >& operator<< (basic_formatting_ostream< CharT, TraitsT, AllocatorT >& strm, auto_newline_manip) | |
42 | { | |
43 | typedef basic_formatting_ostream< CharT, TraitsT, AllocatorT > stream_type; | |
44 | typedef typename stream_type::char_type char_type; | |
45 | typedef typename stream_type::string_type string_type; | |
46 | if (BOOST_LIKELY(strm.good())) | |
47 | { | |
48 | string_type* str = strm.rdbuf()->storage(); | |
49 | if (BOOST_LIKELY(!!str)) | |
50 | { | |
51 | strm.rdbuf()->pubsync(); | |
52 | if (str->empty() || *str->rbegin() != static_cast< char_type >('\n')) | |
53 | strm.rdbuf()->push_back(static_cast< char_type >('\n')); | |
54 | } | |
55 | } | |
56 | ||
57 | return strm; | |
58 | } | |
59 | ||
60 | BOOST_LOG_CLOSE_NAMESPACE // namespace log | |
61 | ||
62 | } // namespace boost | |
63 | ||
64 | #include <boost/log/detail/footer.hpp> | |
65 | ||
66 | #endif // BOOST_LOG_UTILITY_MANIPULATORS_AUTO_NEWLINE_HPP_INCLUDED_ |