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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Using Boost.Asio</title> <link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="../boost_asio.html" title="Boost.Asio"> <link rel="up" href="../boost_asio.html" title="Boost.Asio"> <link rel="prev" href="overview/implementation.html" title="Platform-Specific Implementation Notes"> <link rel="next" href="tutorial.html" title="Tutorial"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> <td align="center"><a href="../../../index.html">Home</a></td> <td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="overview/implementation.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../boost_asio.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../boost_asio.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="tutorial.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="boost_asio.using"></a><a class="link" href="using.html" title="Using Boost.Asio">Using Boost.Asio</a> </h2></div></div></div> <h4> <a name="boost_asio.using.h0"></a> <span class="phrase"><a name="boost_asio.using.supported_platforms"></a></span><a class="link" href="using.html#boost_asio.using.supported_platforms">Supported Platforms</a> </h4> <p> The following platform and compiler combinations are regularly tested: </p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"> Linux using g++ 4.1 or later </li> <li class="listitem"> Linux using clang 3.2 or later </li> <li class="listitem"> FreeBSD using g++ 4.1 or later </li> <li class="listitem"> macOS using Xcode 8 or later </li> <li class="listitem"> Win32 using Visual C++ 9.0 or later </li> <li class="listitem"> Win32 using g++ 4.1 or later (MinGW) </li> <li class="listitem"> Win64 using Visual C++ 9.0 or later </li> </ul></div> <p> The following platforms may also work: </p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"> AIX </li> <li class="listitem"> Android </li> <li class="listitem"> HP-UX </li> <li class="listitem"> iOS </li> <li class="listitem"> NetBSD </li> <li class="listitem"> OpenBSD </li> <li class="listitem"> QNX Neutrino </li> <li class="listitem"> Solaris </li> <li class="listitem"> Tru64 </li> <li class="listitem"> Win32 using Cygwin. (<code class="computeroutput">__USE_W32_SOCKETS</code> must be defined.) </li> </ul></div> <h4> <a name="boost_asio.using.h1"></a> <span class="phrase"><a name="boost_asio.using.dependencies"></a></span><a class="link" href="using.html#boost_asio.using.dependencies">Dependencies</a> </h4> <p> The following libraries must be available in order to link programs that use Boost.Asio: </p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"> Boost.System for the <code class="computeroutput">boost::system::error_code</code> and <code class="computeroutput">boost::system::system_error</code> classes. </li> <li class="listitem"> Boost.Coroutine (optional) if you use <a class="link" href="reference/spawn.html" title="spawn"><code class="computeroutput">spawn()</code></a> to launch coroutines. </li> <li class="listitem"> Boost.Regex (optional) if you use any of the <a class="link" href="reference/read_until.html" title="read_until"><code class="computeroutput">read_until()</code></a> or <a class="link" href="reference/async_read_until.html" title="async_read_until"><code class="computeroutput">async_read_until()</code></a> overloads that take a <code class="computeroutput">boost::regex</code> parameter. </li> <li class="listitem"> <a href="http://www.openssl.org" target="_top">OpenSSL</a> (optional) if you use Boost.Asio's SSL support. </li> </ul></div> <p> Furthermore, some of the examples also require the Boost.Thread, Boost.Date_Time or Boost.Serialization libraries. </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p> With MSVC or Borland C++ you may want to add <code class="computeroutput">-DBOOST_DATE_TIME_NO_LIB</code> and <code class="computeroutput">-DBOOST_REGEX_NO_LIB</code> to your project settings to disable autolinking of the Boost.Date_Time and Boost.Regex libraries respectively. Alternatively, you may choose to build these libraries and link to them. </p></td></tr> </table></div> <h4> <a name="boost_asio.using.h2"></a> <span class="phrase"><a name="boost_asio.using.building_boost_libraries"></a></span><a class="link" href="using.html#boost_asio.using.building_boost_libraries">Building Boost Libraries</a> </h4> <p> You may build the subset of Boost libraries required to use Boost.Asio and its examples by running the following command from the root of the Boost download package: </p> <pre class="programlisting">b2 --with-system --with-thread --with-date_time --with-regex --with-serialization stage </pre> <p> This assumes that you have already built <code class="computeroutput">b2</code>. Consult the Boost.Build documentation for more details. </p> <h4> <a name="boost_asio.using.h3"></a> <span class="phrase"><a name="boost_asio.using.optional_separate_compilation"></a></span><a class="link" href="using.html#boost_asio.using.optional_separate_compilation">Optional separate compilation</a> </h4> <p> By default, Boost.Asio is a header-only library. However, some developers may prefer to build Boost.Asio using separately compiled source code. To do this, add <code class="computeroutput">#include <boost/asio/impl/src.hpp></code> to one (and only one) source file in a program, then build the program with <code class="computeroutput">BOOST_ASIO_SEPARATE_COMPILATION</code> defined in the project/compiler settings. Alternatively, <code class="computeroutput">BOOST_ASIO_DYN_LINK</code> may be defined to build a separately-compiled Boost.Asio as part of a shared library. </p> <p> If using Boost.Asio's SSL support, you will also need to add <code class="computeroutput">#include <boost/asio/ssl/impl/src.hpp></code>. </p> <h4> <a name="boost_asio.using.h4"></a> <span class="phrase"><a name="boost_asio.using.macros"></a></span><a class="link" href="using.html#boost_asio.using.macros">Macros</a> </h4> <p> The macros listed in the table below may be used to control the behaviour of Boost.Asio. </p> <div class="informaltable"><table class="table"> <colgroup> <col> <col> </colgroup> <thead><tr> <th> <p> Macro </p> </th> <th> <p> Description </p> </th> </tr></thead> <tbody> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_ENABLE_BUFFER_DEBUGGING</code> </p> </td> <td> <p> Enables Boost.Asio's buffer debugging support, which can help identify when invalid buffers are used in read or write operations (e.g. if a std::string object being written is destroyed before the write operation completes). </p> <p> When using Microsoft Visual C++ 11.0 or later, this macro is defined automatically if the compiler's iterator debugging support is enabled, unless <code class="computeroutput">BOOST_ASIO_DISABLE_BUFFER_DEBUGGING</code> has been defined. </p> <p> When using g++, this macro is defined automatically if standard library debugging is enabled (<code class="computeroutput">_GLIBCXX_DEBUG</code> is defined), unless <code class="computeroutput">BOOST_ASIO_DISABLE_BUFFER_DEBUGGING</code> has been defined. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_DISABLE_BUFFER_DEBUGGING</code> </p> </td> <td> <p> Explictly disables Boost.Asio's buffer debugging support. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_DISABLE_DEV_POLL</code> </p> </td> <td> <p> Explicitly disables <code class="literal">/dev/poll</code> support on Solaris, forcing the use of a <code class="computeroutput">select</code>-based implementation. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_DISABLE_EPOLL</code> </p> </td> <td> <p> Explicitly disables <code class="computeroutput">epoll</code> support on Linux, forcing the use of a <code class="computeroutput">select</code>-based implementation. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_DISABLE_EVENTFD</code> </p> </td> <td> <p> Explicitly disables <code class="computeroutput">eventfd</code> support on Linux, forcing the use of a pipe to interrupt blocked epoll/select system calls. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_DISABLE_KQUEUE</code> </p> </td> <td> <p> Explicitly disables <code class="computeroutput">kqueue</code> support on macOS and BSD variants, forcing the use of a <code class="computeroutput">select</code>-based implementation. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_DISABLE_IOCP</code> </p> </td> <td> <p> Explicitly disables I/O completion ports support on Windows, forcing the use of a <code class="computeroutput">select</code>-based implementation. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_DISABLE_THREADS</code> </p> </td> <td> <p> Explicitly disables Boost.Asio's threading support, independent of whether or not Boost as a whole supports threads. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_NO_WIN32_LEAN_AND_MEAN</code> </p> </td> <td> <p> By default, Boost.Asio will automatically define <code class="computeroutput">WIN32_LEAN_AND_MEAN</code> when compiling for Windows, to minimise the number of Windows SDK header files and features that are included. The presence of <code class="computeroutput">BOOST_ASIO_NO_WIN32_LEAN_AND_MEAN</code> prevents <code class="computeroutput">WIN32_LEAN_AND_MEAN</code> from being defined. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_NO_NOMINMAX</code> </p> </td> <td> <p> By default, Boost.Asio will automatically define <code class="computeroutput">NOMINMAX</code> when compiling for Windows, to suppress the definition of the <code class="computeroutput">min()</code> and <code class="computeroutput">max()</code> macros. The presence of <code class="computeroutput">BOOST_ASIO_NO_NOMINMAX</code> prevents <code class="computeroutput">NOMINMAX</code> from being defined. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_NO_DEFAULT_LINKED_LIBS</code> </p> </td> <td> <p> When compiling for Windows using Microsoft Visual C++ or Borland C++, Boost.Asio will automatically link in the necessary Windows SDK libraries for sockets support (i.e. <code class="literal">ws2_32.lib</code> and <code class="literal">mswsock.lib</code>, or <code class="literal">ws2.lib</code> when building for Windows CE). The <code class="computeroutput">BOOST_ASIO_NO_DEFAULT_LINKED_LIBS</code> macro prevents these libraries from being linked. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_ENABLE_CANCELIO</code> </p> </td> <td> <p> Enables use of the <code class="computeroutput">CancelIo</code> function on older versions of Windows. If not enabled, calls to <code class="computeroutput">cancel()</code> on a socket object will always fail with <code class="computeroutput">asio::error::operation_not_supported</code> when run on Windows XP, Windows Server 2003, and earlier versions of Windows. When running on Windows Vista, Windows Server 2008, and later, the <code class="computeroutput">CancelIoEx</code> function is always used. </p> <p> The <code class="computeroutput">CancelIo</code> function has two issues that should be considered before enabling its use: </p> <p> * It will only cancel asynchronous operations that were initiated in the current thread. </p> <p> * It can appear to complete without error, but the request to cancel the unfinished operations may be silently ignored by the operating system. Whether it works or not seems to depend on the drivers that are installed. </p> <p> For portable cancellation, consider using one of the following alternatives: </p> <p> * Disable asio's I/O completion port backend by defining BOOST_ASIO_DISABLE_IOCP. </p> <p> * Use the socket object's close() function to simultaneously cancel the outstanding operations and close the socket. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_NO_TYPEID</code> </p> </td> <td> <p> Disables uses of the <code class="computeroutput">typeid</code> operator in Boost.Asio. Defined automatically if <code class="computeroutput">BOOST_NO_TYPEID</code> is defined. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput">BOOST_ASIO_HASH_MAP_BUCKETS</code> </p> </td> <td> <p> Determines the number of buckets in Boost.Asio's internal <code class="computeroutput">hash_map</code> objects. The value should be a comma separated list of prime numbers, in ascending order. The <code class="computeroutput">hash_map</code> implementation will automatically increase the number of buckets as the number of elements in the map increases. </p> <p> Some examples: </p> <p> * Defining <code class="computeroutput">BOOST_ASIO_HASH_MAP_BUCKETS</code> to <code class="computeroutput">1021</code> means that the <code class="computeroutput">hash_map</code> objects will always contain 1021 buckets, irrespective of the number of elements in the map. </p> <p> * Defining <code class="computeroutput">BOOST_ASIO_HASH_MAP_BUCKETS</code> to <code class="computeroutput">53,389,1543</code> means that the <code class="computeroutput">hash_map</code> objects will initially contain 53 buckets. The number of buckets will be increased to 389 and then 1543 as elements are added to the map. </p> </td> </tr> </tbody> </table></div> <h4> <a name="boost_asio.using.h5"></a> <span class="phrase"><a name="boost_asio.using.mailing_list"></a></span><a class="link" href="using.html#boost_asio.using.mailing_list">Mailing List</a> </h4> <p> A mailing list specifically for Boost.Asio may be found on <a href="http://sourceforge.net/mail/?group_id=122478" target="_top">SourceForge.net</a>. Newsgroup access is provided via <a href="http://dir.gmane.org/gmane.comp.lib.boost.asio.user" target="_top">Gmane</a>. </p> <h4> <a name="boost_asio.using.h6"></a> <span class="phrase"><a name="boost_asio.using.wiki"></a></span><a class="link" href="using.html#boost_asio.using.wiki">Wiki</a> </h4> <p> Users are encouraged to share examples, tips and FAQs on the Boost.Asio wiki, which is located at <a href="http://think-async.com/Asio/" target="_top">http://think-async.com/Asio/</a>. </p> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. Kohlhoff<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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="overview/implementation.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../boost_asio.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../boost_asio.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="tutorial.html"><img src="../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>