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    <TITLE>Class Template mode_of</TITLE>
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    <H1 CLASS="title">Class Template <CODE>mode_of</CODE></H1>
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<DL class="page-index">
  <DT><A href="#description">Description</A></DT>
  <DT><A href="#headers">Headers</A></DT>
  <DT><A href="#reference">Reference</A></DT>
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<A NAME="description"></A>
<H2>Description</H2>

<P><A HREF="http://www.boost.org/libs/mpl/doc/refmanual/metafunction.html" TARGET="_top">Metafunction</A> returning a <A HREF="../guide/modes.html#mode_tags">mode tag</A> corresponding the the <A HREF="../guide/modes.html">mode</A> of a model of one of the <A HREF="../guide/concepts.html#filter_concepts">Filter</A> or <A HREF="../guide/concepts.html#device_concepts">Device</A> concepts.</P>

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<H2>Headers</H2>

<DL class="page-index">
  <DT><A CLASS="header" HREF="../../../../boost/iostreams/traits.hpp"><CODE>&lt;boost/iostreams/traits.hpp&gt;</CODE></A></DT>
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<H2>Reference</H2>

<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 HREF="#template_params" CLASS="documented">T</A>&gt;
<SPAN CLASS="keyword">struct</SPAN> mode_of {
    <SPAN CLASS="keyword">typedef</SPAN> <SPAN CLASS="omitted">see below</SPAN> <A HREF="#type" CLASS="documented">type</A>;
};

} } <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>
        <TD VALIGN="top"><I>T</I></TD><TD WIDTH="2em" VALIGN="top">-</TD>
        <TD>A Model of one of the <A HREF="../guide/concepts.html#filter_concepts">Filter</A> or <A HREF="../guide/concepts.html#device_concepts">Device</A> concepts</TD>
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</TABLE>

<A NAME="type"></A>
<H4><CODE>mode_of::type</CODE></H4>

<PRE CLASS="broken_ie">    <SPAN CLASS="keyword">typedef</SPAN> <SPAN CLASS="omitted">implementation-defined</SPAN> <A HREF="#type" CLASS="documented">type</A>;</PRE>

<P>The most-derived <A HREF="../guide/modes.html#mode_tags">mode tag</A> to which <A HREF="../guide/traits.html#category"><CODE>category_of&lt;T&gt;::type</CODE></A> is convertible. If there is no such most-derived tag, a compile-time error occurs.</P>

<P>Modes assigned to standard library types are displayed in the following table.</P>

<TABLE STYLE="margin-bottom:2em" BORDER=1 CELLPADDING=4>
    <TR><TH><CODE>T</CODE></TH><TH><CODE>category</CODE></TH></TR>
    <TR>
        <TD VALIGN="top">Specialization of <CODE>std::basic_iostream</CODE>, or derived from such a specialization</TD>
        <TD><CODE>seekable</CODE></TD>
    </TR>
    <TR>
        <TD VALIGN="top">Specialization of <CODE>std::basic_istream</CODE>, or derived from such a specialization</TD>
        <TD><CODE>input_seekable</CODE></TD>
    </TR>
    <TR>
        <TD VALIGN="top">Specialization of <CODE>std::basic_ostream</CODE>, or derived from such a specialization</TD>
        <TD><CODE>output_seekable</CODE></TD>
    </TR>
    <TR>
        <TD VALIGN="top">Specialization of <CODE>std::basic_streambuf</CODE>, or derived from such a specialization</TD>
        <TD><CODE>seekable</CODE></TD>
    </TR>
    <TR>
        <TD VALIGN="top">Specialization of <CODE>std::back_insert_iterator</CODE>, or derived from such a specialization</TD>
        <TD><CODE>output</CODE></TD>
    </TR>
</TABLE>

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<P CLASS="copyright">Revised 02 Feb 2008</P>

<P CLASS="copyright">&copy; Copyright 2008 <a href="http://www.coderage.com/" target="_top">CodeRage, LLC</a><br/>&copy; Copyright 2004-2007 <a href="http://www.coderage.com/turkanis/" target="_top">Jonathan Turkanis</a></P>
<P CLASS="copyright"> 
    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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