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    <TITLE>Function Template optimal_buffer_size</TITLE>
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    <H1 CLASS="title">Function Template <CODE>optimal_buffer_size</CODE></H1>
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  <DT><A href="#overview">Overview</A></DT>
  <DT><A href="#headers">Headers</A></DT>
  <DT><A href="#reference">Reference</A></DT>
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<A NAME="overview"></A>
<H2>Overview</H2>

<P>
    The function template <CODE>optimal_buffer_size</CODE> returns the size of the character buffer which is allocated for a Filter or Device by library streams, stream buffers and chains if no buffer size is explicitly specified.
</P>

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<H2>Headers</H2>

<DL>
  <DT><A CLASS="header" HREF="../../../../boost/iostreams/optimal_buffer_size.hpp"><CODE>&lt;boost/iostreams/optimal_buffer_size.hpp&gt;</CODE></A></DT>
  <DT><A CLASS="header" HREF="../../../../boost/iostreams/operations.hpp"><CODE>&lt;boost/iostreams/operations.hpp&gt;</CODE></A></DT>
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<A NAME="reference"></A>
<H2>Reference</H2>

<A NAME="synopsis"></A>
<H4>Synopsis</H4>

<PRE CLASS="broken_ie"><SPAN CLASS="keyword">namespace</SPAN> boost { <SPAN CLASS="keyword">namespace</SPAN> iostreams {
              
<SPAN CLASS="keyword">template</SPAN>&lt;<SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="#template_params">T</A>&gt;
std::streamsize <A CLASS="documented" HREF="#optimal_buffer_size">optimal_buffer_size</A>(T&amp; t);

} } <SPAN CLASS="comment">// End namespace boost::io</SPAN></PRE>

<A NAME="template_params"></A>
<H4>Template Parameters</H4>

<TABLE STYLE="margin-left:2em" BORDER=0 CELLPADDING=2>
<TR>
    <TR>
        <TD VALIGN="top"><I>T</I></TD><TD WIDTH="2em" VALIGN="top">-</TD>
        <TD>A model of <A HREF="../concepts/filter.html">Filter</A> or <A HREF="../concepts/device.html">Device</A>.
    </TR>
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<A NAME="optimal_buffer_size"></A>
<PRE CLASS="broken_ie"><SPAN CLASS="keyword">template</SPAN>&lt;<SPAN CLASS="keyword">typename</SPAN> T&gt;
std::streamsize optimal_buffer_size(T&amp; t);</PRE>

<P>The semantics of <CODE>optimal_buffer_size</CODE> depends on the <A HREF="../guide/traits.html#category">category</A> of <CODE>T</CODE> as follows:</P>

<TABLE STYLE="margin-left:2em;margin-bottom:2em" BORDER=1 CELLPADDING=4>
    <TR><TH><CODE>category_of&lt;T&gt;::type</CODE></TH><TH>semantics</TH></TR>
    <TR>
        <TD VALIGN="top">convertible to <A HREF="../guide/traits.html#category_tags"><CODE>optimally_buffered_tag</CODE></A></TD>
        <TD>Returns <CODE>t.optimal_buffer_size()</CODE>.</TD>
    </TR>
    <TR>
        <TD VALIGN="top">convertible to <A HREF="../guide/traits.html#category_tags"><CODE>filter_tag</CODE></A> but not to <A HREF="../guide/traits.html#category_tags"><CODE>optimally_buffered_tag</CODE></A></TD>
        <TD>Returns <A HREF='../macros/buffer_sizes.html'><CODE>default_filter_buffer_size</CODE></A>.</TD>
    </TR>
    <TR>
        <TD VALIGN="top">otherwise</TD>
        <TD>Returns <A HREF='../macros/buffer_sizes.html'><CODE>default_device_buffer_size</CODE></A>.</TD>
    </TR>
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    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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