1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<HTML> 3<HEAD> 4 <TITLE>Class Template mode_of</TITLE> 5 <LINK REL="stylesheet" HREF="../../../../boost.css"> 6 <LINK REL="stylesheet" HREF="../theme/iostreams.css"> 7</HEAD> 8<BODY> 9 10<!-- Begin Banner --> 11 12 <H1 CLASS="title">Class Template <CODE>mode_of</CODE></H1> 13 <HR CLASS="banner"> 14 15<!-- End Banner --> 16 17<DL class="page-index"> 18 <DT><A href="#description">Description</A></DT> 19 <DT><A href="#headers">Headers</A></DT> 20 <DT><A href="#reference">Reference</A></DT> 21</DL> 22 23<HR> 24 25<A NAME="description"></A> 26<H2>Description</H2> 27 28<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> 29 30<A NAME="headers"></A> 31<H2>Headers</H2> 32 33<DL class="page-index"> 34 <DT><A CLASS="header" HREF="../../../../boost/iostreams/traits.hpp"><CODE><boost/iostreams/traits.hpp></CODE></A></DT> 35</DL> 36 37<A NAME="reference"></A> 38<H2>Reference</H2> 39 40<H4>Synopsis</H4> 41 42<PRE CLASS="broken_ie"><SPAN CLASS="keyword">namespace</SPAN> boost { <SPAN CLASS="keyword">namespace</SPAN> iostreams { 43 44<SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> <A HREF="#template_params" CLASS="documented">T</A>> 45<SPAN CLASS="keyword">struct</SPAN> mode_of { 46 <SPAN CLASS="keyword">typedef</SPAN> <SPAN CLASS="omitted">see below</SPAN> <A HREF="#type" CLASS="documented">type</A>; 47}; 48 49} } <SPAN CLASS="comment">// End namespace boost::io</SPAN></PRE> 50 51<A NAME="template_params"></A> 52<H4>Template parameters</H4> 53 54<TABLE STYLE="margin-left:2em" BORDER=0 CELLPADDING=2> 55 <TR> 56 <TD VALIGN="top"><I>T</I></TD><TD WIDTH="2em" VALIGN="top">-</TD> 57 <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> 58 </TR> 59</TABLE> 60 61<A NAME="type"></A> 62<H4><CODE>mode_of::type</CODE></H4> 63 64<PRE CLASS="broken_ie"> <SPAN CLASS="keyword">typedef</SPAN> <SPAN CLASS="omitted">implementation-defined</SPAN> <A HREF="#type" CLASS="documented">type</A>;</PRE> 65 66<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<T>::type</CODE></A> is convertible. If there is no such most-derived tag, a compile-time error occurs.</P> 67 68<P>Modes assigned to standard library types are displayed in the following table.</P> 69 70<TABLE STYLE="margin-bottom:2em" BORDER=1 CELLPADDING=4> 71 <TR><TH><CODE>T</CODE></TH><TH><CODE>category</CODE></TH></TR> 72 <TR> 73 <TD VALIGN="top">Specialization of <CODE>std::basic_iostream</CODE>, or derived from such a specialization</TD> 74 <TD><CODE>seekable</CODE></TD> 75 </TR> 76 <TR> 77 <TD VALIGN="top">Specialization of <CODE>std::basic_istream</CODE>, or derived from such a specialization</TD> 78 <TD><CODE>input_seekable</CODE></TD> 79 </TR> 80 <TR> 81 <TD VALIGN="top">Specialization of <CODE>std::basic_ostream</CODE>, or derived from such a specialization</TD> 82 <TD><CODE>output_seekable</CODE></TD> 83 </TR> 84 <TR> 85 <TD VALIGN="top">Specialization of <CODE>std::basic_streambuf</CODE>, or derived from such a specialization</TD> 86 <TD><CODE>seekable</CODE></TD> 87 </TR> 88 <TR> 89 <TD VALIGN="top">Specialization of <CODE>std::back_insert_iterator</CODE>, or derived from such a specialization</TD> 90 <TD><CODE>output</CODE></TD> 91 </TR> 92</TABLE> 93 94<!-- Begin Footer --> 95 96<HR> 97 98<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></P> 99<P CLASS="copyright"> 100 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>) 101</P> 102 103<!-- End Footer --> 104 105</BODY> 106