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><boost/iostreams/concepts.hpp></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><<SPAN CLASS="keyword">typename</SPAN> Mode, <SPAN CLASS="keyword">typename</SPAN> Ch = <SPAN CLASS="keyword">char</SPAN>> |
---|
51 | <SPAN CLASS="keyword">struct</SPAN> <A CLASS="documented" HREF="#description">device</A>; |
---|
52 | |
---|
53 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Mode, <SPAN CLASS="keyword">typename</SPAN> Ch = <SPAN CLASS="keyword">wchar_t</SPAN>> |
---|
54 | <SPAN CLASS="keyword">struct</SPAN> <SPAN CLASS="defined">wdevice</SPAN> : device<Mode, Ch> { }; |
---|
55 | |
---|
56 | <SPAN CLASS="keyword">typedef</SPAN> device<input> <SPAN CLASS="defined">source</SPAN></A>; |
---|
57 | <SPAN CLASS="keyword">typedef</SPAN> device<output> <SPAN CLASS="defined">sink</SPAN>; |
---|
58 | <SPAN CLASS="keyword">typedef</SPAN> wdevice<input> <SPAN CLASS="defined">wsource</SPAN>; |
---|
59 | <SPAN CLASS="keyword">typedef</SPAN> wdevice<output> <SPAN CLASS="defined">wsink</SPAN>; |
---|
60 | |
---|
61 | <SPAN CLASS="keyword">template</SPAN><<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>> |
---|
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 --> |
---|
121 | 20 May, 2004 |
---|
122 | <!--webbot bot="Timestamp" endspan i-checksum="38504" --> |
---|
123 | </P> |
---|
124 | |
---|
125 | <P CLASS="copyright">© 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> |
---|