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| <div class="titlepage"><div> |
| <div><h2 class="title"> |
| <a name="log"></a>Chapter 1. Boost.Log v2</h2></div> |
| <div><div class="author"><h3 class="author"> |
| <span class="firstname">Andrey</span> <span class="surname">Semashev</span> |
| </h3></div></div> |
| <div><p class="copyright">Copyright © 2007-2015 Andrey |
| Semashev</p></div> |
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| <a name="log.legal"></a><p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>). |
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| <div class="toc"> |
| <p><b>Table of Contents</b></p> |
| <dl class="toc"> |
| <dt><span class="section"><a href="index.html#log.moti">Motivation</a></span></dt> |
| <dt><span class="section"><a href="log/how_to_read.html">How to read the documentation</a></span></dt> |
| <dt><span class="section"><a href="log/installation.html">Installation and compatibility</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="log/installation.html#log.installation.supported_compilers">Supported compilers |
| and platforms</a></span></dt> |
| <dt><span class="section"><a href="log/installation/config.html">Configuring and building the |
| library</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="log/defs.html">Definitions</a></span></dt> |
| <dt><span class="section"><a href="log/design.html">Design overview</a></span></dt> |
| <dt><span class="section"><a href="log/tutorial.html">Tutorial</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="log/tutorial.html#log.tutorial.trivial">Trivial logging</a></span></dt> |
| <dt><span class="section"><a href="log/tutorial/trivial_filtering.html">Trivial logging with |
| filters</a></span></dt> |
| <dt><span class="section"><a href="log/tutorial/sinks.html">Setting up sinks</a></span></dt> |
| <dt><span class="section"><a href="log/tutorial/sources.html">Creating loggers and writing logs</a></span></dt> |
| <dt><span class="section"><a href="log/tutorial/attributes.html">Adding more information to log: |
| Attributes</a></span></dt> |
| <dt><span class="section"><a href="log/tutorial/formatters.html">Log record formatting</a></span></dt> |
| <dt><span class="section"><a href="log/tutorial/advanced_filtering.html">Filtering revisited</a></span></dt> |
| <dt><span class="section"><a href="log/tutorial/wide_char.html">Wide character logging</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="log/detailed.html">Detailed features description</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="log/detailed.html#log.detailed.core">Core facilities</a></span></dt> |
| <dt><span class="section"><a href="log/detailed/sources.html">Logging sources</a></span></dt> |
| <dt><span class="section"><a href="log/detailed/sink_frontends.html">Sink frontends</a></span></dt> |
| <dt><span class="section"><a href="log/detailed/sink_backends.html">Sink backends</a></span></dt> |
| <dt><span class="section"><a href="log/detailed/expressions.html">Lambda expressions</a></span></dt> |
| <dt><span class="section"><a href="log/detailed/attributes.html">Attributes</a></span></dt> |
| <dt><span class="section"><a href="log/detailed/utilities.html">Utilities</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="log/extension.html">Extending the library</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="log/extension.html#log.extension.sinks">Writing your own sinks</a></span></dt> |
| <dt><span class="section"><a href="log/extension/sources.html">Writing your own sources</a></span></dt> |
| <dt><span class="section"><a href="log/extension/attributes.html">Writing your own attributes</a></span></dt> |
| <dt><span class="section"><a href="log/extension/settings.html">Extending library settings support</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="log/rationale.html">Rationale and FAQ</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="log/rationale.html#log.rationale.why_str_lit">Why string literals as scope |
| names?</a></span></dt> |
| <dt><span class="section"><a href="log/rationale/why_weak_scoped_attributes.html">Why scoped |
| attributes don't override existing attributes?</a></span></dt> |
| <dt><span class="section"><a href="log/rationale/why_weak_record_ordering.html">Why log records |
| are weakly ordered in a multithreaded application?</a></span></dt> |
| <dt><span class="section"><a href="log/rationale/why_attribute_manips_dont_affect_filters.html">Why |
| attributes set with stream manipulators do not participate in filtering?</a></span></dt> |
| <dt><span class="section"><a href="log/rationale/why_not_lazy_streaming.html">Why not using lazy |
| streaming?</a></span></dt> |
| <dt><span class="section"><a href="log/rationale/why_not_log4j.html">Why not using hierarchy |
| of loggers, like in log4j? Why not Boost.Log4j? Etc.</a></span></dt> |
| <dt><span class="section"><a href="log/rationale/fork_support.html">Does Boost.Log support process |
| forking?</a></span></dt> |
| <dt><span class="section"><a href="log/rationale/init_term_support.html">Does Boost.Log support |
| logging at process initialization and termination?</a></span></dt> |
| <dt><span class="section"><a href="log/rationale/why_crash_on_term.html">Why my application crashes |
| on process termination when file sinks are used?</a></span></dt> |
| <dt><span class="section"><a href="log/rationale/namespace_mangling.html">Why my application |
| fails to link with Boost.Log? What's the fuss about library namespaces?</a></span></dt> |
| <dt><span class="section"><a href="log/rationale/msvc_link_fails_lnk1123.html">Why MSVC 2010 |
| fails to link the library with error LNK1123: failure during conversion to |
| COFF: file invalid or corrupt?</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="log/reference.html">Reference</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="log/reference.html#top_level_headers">Top level headers</a></span></dt> |
| <dt><span class="section"><a href="core_components.html">Core components</a></span></dt> |
| <dt><span class="section"><a href="attributes.html">Attributes</a></span></dt> |
| <dt><span class="section"><a href="expressions.html">Expressions</a></span></dt> |
| <dt><span class="section"><a href="logging_sources.html">Logging sources</a></span></dt> |
| <dt><span class="section"><a href="sinks.html">Sinks</a></span></dt> |
| <dt><span class="section"><a href="utilities.html">Utilities</a></span></dt> |
| <dt><span class="section"><a href="other_libraries_support_layer.html">Other libraries support layer</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="log/changelog.html">Changelog</a></span></dt> |
| <dt><span class="section"><a href="log/todo.html">TODO in future releases</a></span></dt> |
| <dt><span class="section"><a href="log/acknowledgments.html">Acknowledgments</a></span></dt> |
| </dl> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="log.moti"></a><a class="link" href="index.html#log.moti" title="Motivation">Motivation</a> |
| </h2></div></div></div> |
| <p> |
| Today applications grow rapidly, becoming complicated and difficult to test |
| and debug. Most of the time applications run on a remote site, leaving the |
| developer little chance to monitor their execution and figure out the reasons |
| for their failure, once it should happen. Moreover, even the local debugging |
| may become problematic if the application behavior depends heavily on asynchronous |
| side events, such as a device feedback or another process activity. |
| </p> |
| <p> |
| This is where logging can help. The application stores all essential information |
| about its execution to a log, and when something goes wrong this information |
| can be used to analyze the program behavior and make the necessary corrections. |
| There are other very useful applications of logging, such as gathering statistical |
| information and highlighting events (i.e. indicating that some situation has |
| occurred or that the application is experiencing some problems). These tasks |
| have proved to be vital for many real-world industrial applications. |
| </p> |
| <p> |
| This library aims to make logging significantly easier for the application |
| developer. It provides a wide range of out-of-the-box tools along with public |
| interfaces for extending the library. The main goals of the library are: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| Simplicity. A small example code snippet should be enough to get the feel |
| of the library and be ready to use its basic features. |
| </li> |
| <li class="listitem"> |
| Extensibility. A user should be able to extend functionality of the library |
| for collecting and storing information into logs. |
| </li> |
| <li class="listitem"> |
| Performance. The library should have as little performance impact on the |
| user's application as possible. |
| </li> |
| </ul></div> |
| </div> |
| </div> |
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