105 lines
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105 lines
5.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<TITLE>class template back_insert_device</TITLE>
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<LINK REL="stylesheet" HREF="../../../../boost.css">
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<LINK REL="stylesheet" HREF="../theme/iostreams.css">
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</HEAD>
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<BODY>
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<!-- Begin Banner -->
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<H1 CLASS="title">Class Template <CODE>back_insert_device</CODE></H1>
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<HR CLASS="banner">
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<DL class="page-index">
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<DT><A href="#description">Description</A></DT>
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<DT><A href="#headers">Headers</A></DT>
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<DT><A href="#synopsis">Synopsis</A></DT>
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</DL>
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<A NAME="description"></A>
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<H2>Description</H2>
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<P>
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The header <A CLASS="header" HREF="../../../../boost/iostreams/device/back_inserter.hpp"><CODE><boost/iostreams/device/back_inserter.hpp></CODE></A> contains the definition of the class template <CODE>back_insert_device</CODE> — implementing a <A HREF="../concepts/sink.html">Sink</A> which appends to a standard library sequence container — as well as the definition of a corresponding object generator, the function template <CODE>boost::iostreams::back_inserter</CODE>.
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</P>
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<P>
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The Iostream Library allows OutputIterators to be used in many places where <A HREF="../concepts/sink.html">Sinks</A> are allowed. However, using <CODE>boost::iostreams::back_inserter</CODE> my be somewhat more efficient than using <CODE>std::back_inserter</CODE>, since the former uses the function <CODE>insert</CODE> to append a sequence of characters in one operation. Furthermore, <CODE>std::back_insert_iterator</CODE> is not strictly a model of <A HREF="../concepts/sink.html">Sink</A>, so one can write
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</P>
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<PRE CLASS="broken_ie"><SPAN CLASS="keyword">namespace</SPAN> io = boost::iostreams;
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<SPAN CLASS="keyword">typedef</SPAN> io::stream< io::back_insert_device<std::string> > my_stream</PRE>
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<P>But not</P>
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<PRE CLASS="broken_ie"><SPAN CLASS="keyword">typedef</SPAN> io::stream< std::back_insert_iterator<std::string> > my_stream</PRE>
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<A NAME="headers"></A>
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<H2>Headers</H2>
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<DL>
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<DT><A CLASS="header" HREF="../../../../boost/iostreams/device/back_inserter.hpp"><CODE><boost/iostreams/device/back_inserter.hpp></CODE></A></DT>
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</DL>
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<A NAME="synopsis"></A>
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<H2>Synopsis</H2>
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<PRE CLASS="broken_ie"><SPAN CLASS="keyword">namespace</SPAN> boost { <SPAN CLASS="keyword">namespace</SPAN> iostreams {
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<SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> <A HREF="#back_insert_device_template_params" CLASS="documented">Container</A>>
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<SPAN CLASS="keyword">class</SPAN> <A HREF="#back_insert_device_template_params" CLASS="documented">back_insert_device</A> {
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<SPAN CLASS="keyword">public</SPAN>:
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<SPAN CLASS="keyword">typedef</SPAN> <SPAN CLASS="keyword">typename</SPAN> Container::value_type char_type;
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<SPAN CLASS="keyword">typedef</SPAN> sink_tag category;
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<A HREF="#back_insert_device_constructor" CLASS="documented">back_insert_device</A>(Container& cnt);
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<SPAN CLASS="omitted">...</SPAN>
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};
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<SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> <A HREF="#back_insert_device_template_params" CLASS="documented">Container</A>>
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<A CLASS="documented" HREF="#back_insert_device_template_params">back_insert_device</A><Container> <A CLASS="documented" HREF="#back_inserter">back_inserter</A>(Container& cnt);
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} } <SPAN CLASS="comment">// End namespace boost::io</SPAN></PRE>
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<A NAME="back_insert_device_template_params"></A>
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<H4>Template Parameters</H4>
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<TABLE STYLE="margin-left:2em" BORDER=0 CELLPADDING=2>
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<TR>
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<TR>
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<TD VALIGN="top"><I>Container</I></TD><TD WIDTH="2em" VALIGN="top">-</TD>
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<TD>A C++ standard library sequence type (<A CLASS="bib_ref" HREF="../bibliography.html#iso">[ISO]</A>, 23.1.1).
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</TR>
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</TABLE>
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<A NAME="back_insert_device_constructor"></A>
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<H4><CODE>back_insert_device::back_insert_device</CODE></H4>
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<PRE CLASS="broken_ie"> back_insert_device(Container& cnt);</PRE>
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<P>Constructs an instance of <CODE>back_insert_device</CODE> for appending to the given container. The given reference must remain valid for the lifetime of the instance of <CODE>back_insert_device</CODE>.</P>
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<A NAME="back_inserter"></A>
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<H4><CODE>back_inserter</CODE></H4>
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<PRE CLASS="broken_ie"><SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Container>
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back_insert_device<Container> back_inserter(Container& cnt);</PRE>
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<P>Returns an instance of <CODE>back_insert_device</CODE> for appending to the given container.</P>
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<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>
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<P CLASS="copyright">
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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>)
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