60 lines
2.4 KiB
HTML
60 lines
2.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML>
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<HEAD>
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<TITLE>Buffer Sizes</TITLE>
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<LINK REL="stylesheet" HREF="../../../../boost.css">
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<LINK REL="stylesheet" HREF="../theme/iostreams.css">
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</HEAD>
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<STYLE>
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DT A { /*text-decoration:none*/ }
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LI A { /*text-decoration:none;*/ font: 80% Verdana, Tahoma, Arial, Helvetica, sans-serif }
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</STYLE>
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<BODY>
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<!-- Begin Banner -->
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<H1 CLASS="title">Buffer Sizes</H1>
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<HR CLASS="banner">
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<DL class="page-index">
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<DT><A href="#overview">Overview</A></DT>
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<DT><A href="#headers">Headers</A></DT>
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<DT><A href="#synopsis">Synopsis</A></DT>
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</DL>
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<HR>
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<A NAME="overview"></A>
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<H2>Overview</H2>
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<P>
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The macros <CODE>BOOST_IOSTREAMS_DEFAULT_DEVICE_BUFFER_SIZE</CODE>, <CODE>BOOST_IOSTREAMS_DEFAULT_FILTER_BUFFER_SIZE</CODE> and <CODE>BOOST_IOSTREAMS_DEFAULT_PBACK_BUFFER_SIZE</CODE> can be used to configure the default sizes of buffers allocated by the Iostreams library when a <A HREF="../concepts/filter.html">Filter</A> or <A HREF="../concepts/device.html">Device</A> is attached to a <A HREF="../guide/generic_streams.html#stream_buffer"><CODE>stream_buffer</CODE></A> or <A HREF="../guide/generic_streams.html#stream"><CODE>stream</CODE></A>, or when it is added to a <A HREF="../classes/chain.html">chain</A>.
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</P>
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<P>The default values are subject to change in future versions of the Iostreams library.</P>
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<A NAME="headers"></A>
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<H2>Headers</H2>
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<DL class="page-index">
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<DT><A CLASS="header" HREF="../../../../boost/iostreams/constants.hpp"><CODE><boost/iostreams/constants.hpp></CODE></A></DT>
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</DL>
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<A NAME="synopsis"></A>
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<H2>Synopsis</H2>
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<PRE CLASS='broken_ie'><SPAN CLASS='preprocessor'>#define</SPAN> BOOST_IOSTREAMS_DEFAULT_DEVICE_BUFFER_SIZE 4096
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<SPAN CLASS='preprocessor'>#define</SPAN> BOOST_IOSTREAMS_DEFAULT_FILTER_BUFFER_SIZE 128
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<SPAN CLASS='preprocessor'>#define</SPAN> BOOST_IOSTREAMS_DEFAULT_PBACK_BUFFER_SIZE 4</PRE>
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<P CLASS="copyright">© Copyright 2008 <a href="http://www.coderage.com/" target="_top">CodeRage, LLC</a><br/>© Copyright 2004-2007 <a href="https://www.boost.org/users/people/jonathan_turkanis.html" target="_top">Jonathan Turkanis</a><br/>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">http://www.boost.org/LICENSE_1_0.txt</A>)
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