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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
2<HTML>
3<HEAD>
4    <TITLE>Class Template device</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>device</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>
29    The class template <CODE>device</CODE>, its subcass <CODE>wdevice</CODE> and their specializations <CODE>source</CODE>, <CODE>sink</CODE>, <CODE>wsource</CODE> and <CODE>wsink</CODE> are provided by the Iostreams library to ease the definitions of new models of the various <A HREF="../guide/concepts.html#device_concepts">Device Concepts</A>. These templates and <CODE>typedef</CODE>s are inteded to be used as base classes for user-defined Devices. They supply the member types <CODE>char_type</CODE> and <CODE>category</CODE> used by the Iostreams library.
30</P>
31<P>
32    The supplied <CODE>category</CODE> member is convertible to <A HREF="../guide/traits.html#category_tags"><CODE>closable_tag</CODE></A> and to <A HREF="../guide/traits.html#category_tags"><CODE>localizable_tag</CODE></A>. This allows users to define models of the concepts <A HREF="../concepts/closable.html">Closable</A> and <A HREF="../concepts/closable.html">Localizable</A> simply by providing definitions of member functions <CODE>close</CODE> and <CODE>imbue</CODE>.
33</P>
34
35<A NAME="headers"></A>
36<H2>Headers</H2>
37
38<DL class="page-index">
39  <DT><A CLASS="header" HREF="../../../../boost/iostreams/concepts.hpp"><CODE>&lt;boost/iostreams/concepts.hpp&gt;</CODE></A></DT>
40</DL>
41
42<A NAME="reference"></A>
43<H2>Reference</H2>
44
45<A NAME="synopsis"></A>
46<H3>Synopsis</H3>
47
48<PRE CLASS="broken_ie"><SPAN CLASS="keyword">namespace</SPAN> boost{ <SPAN CLASS="keyword">namespace</SPAN> iostreams {
49
50<SPAN CLASS="keyword">template</SPAN>&lt;<SPAN CLASS="keyword">typename</SPAN> Mode, <SPAN CLASS="keyword">typename</SPAN> Ch = <SPAN CLASS="keyword">char</SPAN>&gt;
51<SPAN CLASS="keyword">struct</SPAN> <A CLASS="documented" HREF="#description">device</A>;
52
53<SPAN CLASS="keyword">template</SPAN>&lt;<SPAN CLASS="keyword">typename</SPAN> Mode, <SPAN CLASS="keyword">typename</SPAN> Ch = <SPAN CLASS="keyword">wchar_t</SPAN>&gt;
54<SPAN CLASS="keyword">struct</SPAN> <SPAN CLASS="defined">wdevice</SPAN> : device&lt;Mode, Ch&gt; { };
55
56<SPAN CLASS="keyword">typedef</SPAN> device&lt;input&gt;    <SPAN CLASS="defined">source</SPAN></A>;
57<SPAN CLASS="keyword">typedef</SPAN> device&lt;output&gt;   <SPAN CLASS="defined">sink</SPAN>;
58<SPAN CLASS="keyword">typedef</SPAN> wdevice&lt;input&gt;   <SPAN CLASS="defined">wsource</SPAN>;
59<SPAN CLASS="keyword">typedef</SPAN> wdevice&lt;output&gt;  <SPAN CLASS="defined">wsink</SPAN>;
60
61<SPAN CLASS="keyword">template</SPAN>&lt;<SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="#template_params">Mode</A>, <SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="#template_params">Ch</A> = <SPAN CLASS="keyword">char</SPAN>&gt;
62<SPAN CLASS="keyword">struct</SPAN> <A CLASS="documented" HREF="#description">device</A> {
63    <SPAN CLASS="keyword">typedef</SPAN> Ch         char_type;
64    <SPAN CLASS="keyword">typedef</SPAN> <A STYLE="text-decoration:none" HREF="#category"><SPAN CLASS="omitted">see below</SPAN></A>  category;
65    <SPAN CLASS="keyword">void</SPAN> <A CLASS="documented" HREF="#close">close</A>();
66    <SPAN CLASS="keyword">void</SPAN> <A CLASS="documented" HREF="#close">close</A>(std::ios_base::openmode);
67    <SPAN CLASS="keyword">void</SPAN> <A CLASS="documented" HREF="#imbue">imbue</A>(<SPAN CLASS="keyword">const</SPAN> std::locale&);
68};
69
70} } <SPAN CLASS="comment">// End namespace boost::io</SPAN></PRE>
71
72<A NAME="template_params"></A>
73<H4>Template parameters</H4>
74
75<TABLE STYLE="margin-left:2em" BORDER=0 CELLPADDING=2>
76<TR>
77    <TR>
78        <TD VALIGN="top"><I>Mode</I></TD><TD WIDTH="2em" VALIGN="top">-</TD>
79        <TD>A <A HREF="../guide/modes.html#mode_tags">mode tag</A>.</TD>
80    </TR>
81    <TR>
82        <TD VALIGN="top"><I>Ch</I></TD><TD WIDTH="2em" VALIGN="top">-</TD>
83        <TD>The character type</TD>
84    </TR>
85</TABLE>
86
87<A NAME="category"></A>
88<H4><CODE>device::category</CODE></H4>
89
90<PRE CLASS="broken_ie">    <SPAN CLASS="keyword">typedef</SPAN> <SPAN CLASS="omitted">see below</SPAN> category;</PRE>
91
92<P>
93    A category tag convertible to <A HREF="#template_params"><CODE>Mode</CODE></A>, <A HREF="../guide/traits.html#category_tags"><CODE>device_tag</CODE></A>, <A HREF="../guide/traits.html#category_tags"><CODE>closable_tag</CODE></A> and <A HREF="../guide/traits.html#category_tags"><CODE>localizable_tag</CODE></A>.
94</P>
95   
96<A NAME="close"></A>
97<H4><CODE>device::close</CODE></H4>
98<PRE CLASS="broken_ie">    <SPAN CLASS="keyword">void</SPAN> <A CLASS="documented" HREF="#close">close</A>();
99    <SPAN CLASS="keyword">void</SPAN> <A CLASS="documented" HREF="#close">close</A>(std::ios_base::openmode);</PRE>
100
101<P>
102    Both overloads are implemented as no-ops. The second is available only if <A HREF="#template_params">Mode</A> is convertible to <A HREF="../guide/modes.html#mode_tags"><CODE>bidirectional</CODE></A>. The first is available only if Mode is <I>not</I> convertible to <A HREF="../guide/modes.html#mode_tags"><CODE>bidirectional</CODE></A>.
103</P>
104<P>
105    Required by <A HREF="../concepts/closable.html">Closable</A>.
106</P>
107
108<A NAME="imbue"></A>
109<H4><CODE>device::imbue</CODE></H4>
110<PRE CLASS="broken_ie">    <SPAN CLASS="keyword">void</SPAN> <A CLASS="documented" HREF="#imbue">imbue</A>(<SPAN CLASS="keyword">const</SPAN> std::locale&);</PRE>
111
112<P>
113    Implemented as a no-op. Required by <A HREF="../concepts/localizable.html">Localizable</A>.
114</P>
115
116<!-- Begin Footer -->
117
118<HR>
119<P CLASS="copyright">Revised
120<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
12120 May, 2004
122<!--webbot bot="Timestamp" endspan i-checksum="38504" -->
123</P>
124
125<P CLASS="copyright">&copy; Copyright <A HREF="http://www.kangaroologic.com" TARGET="_top">Jonathan Turkanis</A>, 2004</P>
126<P CLASS="copyright"> 
127    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>)
128</P>
129
130<!-- End Footer -->
131
132</BODY>
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