1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
---|
2 | <HTML> |
---|
3 | <HEAD> |
---|
4 | <TITLE>Class Template chain</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">Function Template <CODE>invert</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>inverse</CODE> is an adapter which transforms an <A HREF='../concepts/input_filter.html'>InputFilter</A> into an <A HREF='../concepts/output_filter.html'>OutputFilter</A> or <I>vice versa</I>. The function template <CODE>invert</CODE> is an <A HREF='../../../../more/generic_programming.html#object_generator' TARGET='_top'>object generator</A> which when passed a Filter returns a instance of an appropriate specialization of <CODE>inverse</CODE>. |
---|
30 | </P> |
---|
31 | |
---|
32 | <P>Given an <A HREF='../concepts/input_filter.html'>InputFilter</A> <CODE>f</CODE>, the inverse of <CODE>f</CODE> is <A HREF='../concepts/multi_character.html'>Multi-Character</A> <A HREF='../concepts/output_filter.html'>OutputFilter</A> whose member function <CODE>write</CODE> is implemented as follows. Given a <A HREF='../concepts/sink.html'>Sink</A> <CODE>snk</CODE> and a character buffer <CODE>s</CODE> of length <CODE>n</CODE>, we |
---|
33 | </P> |
---|
34 | <UL> |
---|
35 | <LI>construct a <A HREF='../concepts/source.html'>Source</A> based on the buffer <CODE>s</CODE> and <A HREF='compose.html'><CODE>compose</CODE></A> it with <CODE>f</CODE> to form a Source, then |
---|
36 | <LI>repeatedly read sequences of characters from the composite Source and write them to <CODE>snk</CODE> until the buffer <CODE>s</CODE> is exhausted. |
---|
37 | </UL> |
---|
38 | |
---|
39 | <P>Similarly, given an <A HREF='../concepts/output_filter.html'>OutputFilter</A> <CODE>f</CODE>, the inverse of <CODE>f</CODE> is <A HREF='../concepts/multi_character.html'>Multi-Character</A> <A HREF='../concepts/input_filter.html'>InputFilter</A> whose member function <CODE>read</CODE> is implemented as follows. Given a <A HREF='../concepts/source.html'>Source</A> <CODE>src</CODE> and a character buffer <CODE>s</CODE> of length <CODE>n</CODE>, we |
---|
40 | </P> |
---|
41 | <UL> |
---|
42 | <LI>construct a <A HREF='../concepts/sink.html'>Sink</A> based on the buffer <CODE>s</CODE> and <A HREF='compose.html'><CODE>compose</CODE></A> it with <CODE>f</CODE> to form a Sink, then |
---|
43 | <LI>repeatedly read sequences of characters from <CODE>src</CODE> and write them to the composite Sink until the buffer <CODE>s</CODE> is full. |
---|
44 | </UL> |
---|
45 | |
---|
46 | <P> |
---|
47 | The <A HREF='../guide/modes.html'>mode</A> of a specialization of <CODE>inverse</CODE> is equal to <A HREF='../guide/modes.html#output'>output</A> if the mode of the underlying filter refines input, and to <A HREF='../guide/modes.html#input'>input</A> otherwise. |
---|
48 | </P> |
---|
49 | |
---|
50 | <A NAME="headers"></A> |
---|
51 | <H2>Headers</H2> |
---|
52 | |
---|
53 | <DL class="page-index"> |
---|
54 | <DT><A CLASS="header" HREF="../../../../boost/iostreams/invert.hpp"><CODE><boost/iostreams/invert.hpp></CODE></A></DT> |
---|
55 | </DL> |
---|
56 | |
---|
57 | <A NAME="reference"></A> |
---|
58 | <H2>Reference</H2> |
---|
59 | |
---|
60 | <A NAME="synopsis"></A> |
---|
61 | <H4>Synopsis</H4> |
---|
62 | |
---|
63 | <PRE CLASS="broken_ie"><SPAN CLASS="keyword">namespace</SPAN> boost { <SPAN CLASS="keyword">namespace</SPAN> iostreams { |
---|
64 | |
---|
65 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="#inverse_template_params">Filter</A>> |
---|
66 | <SPAN CLASS='keyword'>class</SPAN> <A CLASS='documented' HREF='#inverse'>inverse</A> { |
---|
67 | <SPAN CLASS='keyword'>public:</SPAN> |
---|
68 | <SPAN CLASS='keyword'>typedef</SPAN> <SPAN CLASS='keyword'>typename</SPAN> <A CLASS='documented' HREF='../guide/traits.html#char_type_of_ref'>char_type_of</A><Filter>::type char_type; |
---|
69 | <SPAN CLASS='keyword'>typedef</SPAN> <SPAN CLASS='omitted'>see above</SPAN> mode; |
---|
70 | |
---|
71 | <A CLASS='documented' HREF='#inverse_ctor'>inverse</A>(<SPAN CLASS='keyword'>const</SPAN> Filter& filter); |
---|
72 | |
---|
73 | <SPAN CLASS='comment'>// Filter member functions</SPAN> |
---|
74 | }; |
---|
75 | |
---|
76 | <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="#invert_template_params">Filter</A>> |
---|
77 | <A CLASS='documented' HREF='#inverse'>inverse</A><Filter> <A CLASS='documented' HREF='#invert'>invert</A>(<SPAN CLASS='keyword'>const</SPAN> Filter& filter); |
---|
78 | |
---|
79 | } } // End namespace boost::io</PRE> |
---|
80 | |
---|
81 | <A NAME="inverse"></A> |
---|
82 | <H2>Class Template <CODE>inverse</CODE></H2> |
---|
83 | |
---|
84 | <A NAME="inverse_template_params"></A> |
---|
85 | <H4>Template parameters</H4> |
---|
86 | |
---|
87 | <TABLE STYLE="margin-left:2em" BORDER=0 CELLPADDING=2> |
---|
88 | <TR> |
---|
89 | <TR> |
---|
90 | <TD VALIGN="top"><I>Filter</I></TD><TD WIDTH="2em" VALIGN="top">-</TD> |
---|
91 | <TD>A model of <A HREF='../concepts/filter.html'>Filter</A></TD> |
---|
92 | </TR> |
---|
93 | </TABLE> |
---|
94 | |
---|
95 | <A NAME="inverse_ctor"></A> |
---|
96 | <H4><CODE>inverse::inverse</CODE></H4> |
---|
97 | |
---|
98 | <PRE CLASS="broken_ie"> inverse(<SPAN CLASS='keyword'>const</SPAN> Filter& filter);</PRE> |
---|
99 | |
---|
100 | <P> |
---|
101 | Constructs an instance of <CODE>inverse</CODE> based on the given filter. |
---|
102 | </P> |
---|
103 | |
---|
104 | <A NAME="invert"></A> |
---|
105 | <H2>Function Template <CODE>invert</CODE></H2> |
---|
106 | |
---|
107 | <PRE CLASS="broken_ie"><SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Filter> |
---|
108 | inverse<Filter> invert(<SPAN CLASS='keyword'>const</SPAN> Filter& filter);</PRE> |
---|
109 | |
---|
110 | <A NAME="invert_template_params"></A> |
---|
111 | <H4>Template parameters</H4> |
---|
112 | |
---|
113 | <TABLE STYLE="margin-left:2em" BORDER=0 CELLPADDING=2> |
---|
114 | <TR> |
---|
115 | <TR> |
---|
116 | <TD VALIGN="top"><I>Filter</I></TD><TD WIDTH="2em" VALIGN="top">-</TD> |
---|
117 | <TD>A model of <A HREF='../concepts/filter.html'>Filter</A></TD> |
---|
118 | </TR> |
---|
119 | </TABLE> |
---|
120 | |
---|
121 | <P> |
---|
122 | Constructs an instance of an appropriate specialization of <CODE>inverse</CODE> based on the given filter. |
---|
123 | </P> |
---|
124 | |
---|
125 | <!-- Begin Footer --> |
---|
126 | |
---|
127 | <HR> |
---|
128 | <P CLASS="copyright">Revised |
---|
129 | <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan --> |
---|
130 | 20 May, 2004 |
---|
131 | <!--webbot bot="Timestamp" endspan i-checksum="38504" --> |
---|
132 | </P> |
---|
133 | |
---|
134 | <P CLASS="copyright">© Copyright <A HREF="http://www.kangaroologic.com" TARGET="_top">Jonathan Turkanis</A>, 2004</P> |
---|
135 | <P CLASS="copyright"> |
---|
136 | 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>) |
---|
137 | </P> |
---|
138 | |
---|
139 | <!-- End Footer --> |
---|
140 | |
---|
141 | </BODY> |
---|