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    <TITLE>Pipable</TITLE>
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    <H1 CLASS="title">Pipable</H1>
    <HR CLASS="banner">

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<H2>Description</H2>

<P>
    A Pipable Filter can appear as a component of a <A HREF="../guide/pipelines.html">pipline</A>.
</P>

<P>
     Certian overloads of <CODE>operator|</CODE> must be defined to make a Filter Pipable; this is achieved by invoking the macro <A HREF="../guide/pipelines.html#boost_iostreams_pipable"><CODE>BOOST_IOSTREAMS_PIPABLE</CODE></A>.
</P>

<H2>Refinement of</H2>

<A HREF="filter.html">Filter</A>.

<A NAME="types"></A>
<H2>Associated Types</H2>

Same as <A HREF="filter.html">Filter</A>.

<H2>Notation</H2>

<TABLE CELLPADDING="2">
    <TR><TD><CODE>P</CODE></TD><TD>-</TD><TD>A type which is a model of Pipable</TD></TR>
    <TR><TD><CODE>C</CODE></TD><TD>-</TD><TD>A type which is a model of <A HREF="filter.html">Filter</A> or <A HREF="device.html">Device</A> and which is <A HREF="../../../../doc/html/CopyConstructible.html"  TARGET="_top">CopyConstructible</A><A CLASS='footnote_ref' NAME='note_1_ref' HREF="#note_1"><SUP>[1]</A></SUP></TD></TR>
    <TR><TD><CODE>p</CODE></TD><TD>-</TD><TD>Object of type <CODE>P</CODE></TD></TR>
    <TR><TD><CODE>c</CODE></TD><TD>-</TD><TD>Object of type <CODE>C</CODE></TD></TR>
</TABLE>

<H2>Valid Expressions / Semantics</H2>

<TABLE CELLPADDING="5" BORDER="1">
    <TR><TH>Expression</TH><TH>Expression Type</TH><TH>Semantics</TH></TR>
    <TR>
        <TD>
            <PRE CLASS="plain_code"><CODE>f | c</CODE></PRE>
        </TD>
        <TD><I>implementation-defined</I></TD>
        <TD>
           Returns a pipeline corresponding to the sequence <CODE>f</CODE>, <CODE>c</CODE>
        </TD>
    </TR>
</TABLE>

<H2>Exceptions</H2>

<P>
    None.
</P>

<H2>Models</H2>
<UL>
    <LI>All the Filters provided by the Iostreams library.
</UL>

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<P>
    <A CLASS="footnote_ref" NAME="note_1" HREF="#note_1_ref"><SUP>[1]</SUP></A>This requirement prevents streams and stream buffers from appearing in pipelines without the use of <A HREF="../../../../doc/html/ref.html">reference wrappers</A>. This restriction may be removed in a future version of the Iostreams library.
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<P CLASS="copyright">&copy; Copyright 2008 <a href="http://www.coderage.com/" target="_top">CodeRage, LLC</a><br/>&copy; Copyright 2004-2007 <a href="https://www.boost.org/users/people/jonathan_turkanis.html" target="_top">Jonathan Turkanis</a></P>
<P CLASS="copyright"> 
    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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