projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
| 2 | <HTML> | |
| 3 | <HEAD> | |
| 4 | <TITLE>DualUseFilter</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">DualUseFilter</H1> | |
| 13 | <HR CLASS="banner"> | |
| 14 | ||
| 15 | <!-- End Banner --> | |
| 16 | ||
| 17 | <H2>Description</H2> | |
| 18 | ||
| 19 | <P> | |
| 20 | A DualUseFilter is a Filter which can act as an <A HREF="input_filter.html">InputFilter</A> or as an <A HREF="output_filter.html">OutputFilter</A>, but not as both simultaneously. | |
| 21 | </P> | |
| 22 | <P> | |
| 23 | DualUseFilters help reduce the number of different Filter types required to implement a particlar filtering algorithm. For example, by implementing <A HREF="../classes/regex_filter.html"><CODE>basic_regex_filter</CODE></A> as a DualUseFilter, the Iostreams library avoids having to define separate templates <CODE>basic_regex_input_filter</CODE> and <CODE>basic_regex_output_filter</CODE>. | |
| 24 | </P> | |
| 25 | ||
| 26 | <H2>Refinement of</H2> | |
| 27 | ||
| 28 | <P><A HREF="input_filter.html">InputFilter</A>, <A HREF="output_filter.html">OutputFilter</A>.</P> | |
| 29 | ||
| 30 | <H2>Associated Types</H2> | |
| 31 | ||
| 32 | <TABLE CELLPADDING="5" BORDER="1"> | |
| 33 | <TR><TD>Character type</TD><TD>The type of the characters in the filtered sequences</TD></TR> | |
| 34 | <TR> | |
| 35 | <TD>Category</TD> | |
| 36 | <TD> | |
| 37 | A type convertible to <A HREF="../guide/traits.html#category_tags"><CODE>filter_tag</CODE></A> and to <A HREF="../guide/modes.html#mode_tags"><CODE>dual_use</CODE></A> | |
| 38 | </TD> | |
| 39 | </TR> | |
| 40 | <TR> | |
| 41 | <TD>Mode</TD> | |
| 42 | <TD> | |
| 43 | The unique <I>most-derived</I> <A HREF="../guide/modes.html#mode_tags">mode tag</A> to which Category is convertible | |
| 44 | </TD> | |
| 45 | </TR> | |
| 46 | </TABLE> | |
| 47 | ||
| 48 | <H2>Valid Expressions / Semantics</H2> | |
| 49 | ||
| 50 | Same as <A HREF="bidirectional_filter.html">BidirectionalFilter</A>. | |
| 51 | ||
| 52 | <H2>Exceptions</H2> | |
| 53 | ||
| 54 | Same as <A HREF="bidirectional_filter.html">BidirectionalFilter</A>. | |
| 55 | ||
| 56 | <H2>Models</H2> | |
| 57 | ||
| 58 | <UL> | |
| 59 | <LI>The <A HREF="../guide/text_processing.html">Text Processing Filters</A>. | |
| 60 | <LI>The compression and decompression filters, except for <A HREF="../classes/gzip.html#basic_gzip_decompressor"><CODE>basic_gzip_decompressor</CODE></A>. | |
| 61 | </UL> | |
| 62 | ||
| 63 | <!-- Begin Footer --> | |
| 64 | ||
| 65 | <HR> | |
| 66 | ||
| 67 | <P CLASS="copyright">© Copyright 2008 <a href="http://www.coderage.com/" target="_top">CodeRage, LLC</a><br/>© Copyright 2004-2007 <a href="http://www.coderage.com/turkanis/" target="_top">Jonathan Turkanis</a></P> | |
| 68 | <P CLASS="copyright"> | |
| 69 | 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>) | |
| 70 | </P> | |
| 71 | ||
| 72 | <!-- End Footer --> | |
| 73 | ||
| 74 | </BODY> |