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<title>FBB::IOStreambuf</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
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<h1>FBB::IOStreambuf</h1>
<h2>libbobcat-dev_3.23.01-x.tar.gz</h2>
<h2>2005-2014</h2>
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<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
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<title>FBB::IOStreambuf(3bobcat)</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
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<h1>FBB::IOStreambuf(3bobcat)</h1>
<h2>libbobcat-dev_3.23.01-x.tar.gz Streambuf doing I/O</h2>
<h2>2005-2014</h2>
<p>
<h2>NAME</h2>FBB::IOStreambuf - streambuf allowing input and output operations
<p>
<h2>SYNOPSIS</h2>
<strong>#include <bobcat/iostreambuf></strong><br>
Linking option: <em>-lbobcat</em>
<p>
<h2>DESCRIPTION</h2>
This class implements a specialization of the <strong>std::streambuf</strong> class,
allowing input operations from and output operations to different files. It is
intended to be used in combination with <strong>FBB::IOStream</strong>, thus allowing all
stream-based input and output operations using the same object without the
need to use <em>seek</em>-operations. Using an <strong>FBB::IOStream</strong> object it is,
e.g., possible to construct two-way communications using pipes, much like the
facilities offered by sockets.
<p>
If the streams that will be associated with the <strong>IOStreambuf</strong> object
support seeking, then the <strong>IOStreambuf</strong> will do so to. Seeking might also be
availble for a single stream (either the <strong>std::istream</strong> or the
<strong>std::ostream</strong>).
<p>
When the <strong>IOStreambuf</strong> object goes out of scope, its associated
<strong>std::ostream</strong> object is flushed.
<p>
<h2>NAMESPACE</h2>
<strong>FBB</strong><br>
All constructors, members, operators and manipulators, mentioned in this
man-page, are defined in the namespace <strong>FBB</strong>.
<p>
<h2>INHERITS FROM</h2>
<strong>std::streambuf</strong>
<p>
<h2>CONSTRUCTORS</h2>
<ul>
<li> <strong>IOStreambuf()</strong>:<br>
The default constructor results in a <strong>IOStreambuf</strong> object that
cannot be immediately used. Its member <strong>open()</strong> must be called first.
<li> <strong>IOStreambuf(std::istream &in, std::ostream &out)</strong>:<br>
This constructor associates the <strong>IOStreambuf</strong> object with a
<strong>std::istream</strong> and a <strong>std::ostream</strong>. All output operations will be passed
on to the <strong>std::ostream</strong>, all input operations to the <strong>std::istream</strong>. The
streams passed to <strong>IOStreambuf()</strong> should outlive the <strong>IOStreambuf</strong>
object.
</ul>
Copy and move constructors is not available.
<p>
<h2>MEMBER FUNCTIONS</h2>
All members of <strong>std::streambuf</strong> are
available, as <strong>FBB::IOStreambuf</strong> inherits from these classes.
<ul>
<li> <strong>void open(std::istream &in, std::ostream &out)</strong>:<br>
This member (re)associates the <strong>IOStreambuf</strong> object with a
<strong>std::istream</strong> and a <strong>std::ostream</strong>. All output operations will be passed
on to the <strong>std::ostream</strong>, all input operations to the <strong>std::istream</strong>. The
streams passed to <strong>IOStreambuf()</strong> should outlive the <strong>IOStreambuf</strong>
object. If this member is called for an <strong>IOStreambuf</strong> object already
associated with an <strong>std::ostream</strong> object, the already associated
<strong>std::ostream</strong> object is flushed before setting up the new association.
</ul>
<p>
<h2>VIRTUAL PROTECTED MEMBER FUNCTIONS</h2>
<p>
The following <strong>std::streambuf</strong> member functions should only be called
when the <strong>FBB::Streambuf</strong> object is associated with <strong>std::istream</strong> and
<strong>std::ostream</strong> objects (i.e., they should not be called between the
construction of a default <strong>FBB:IOStreambuf</strong> object and a subsequent call of
<strong>IOStreambuf::open()</strong>):
<p>
The members listed in this section implement the tasks of
comparably named virtual function in the class's private interface. This
separates the redefinable interface from the user-interface. The class
<strong>IOStreamBuf</strong> can, in accordance with Liskov's Substitution Principle, be
used as a <em>std:streambuf</em>; but it also offers facilities for classes
deriving from <strong>IOStreamBuf</strong>. These facilities are listed here.
<p>
<ul>
<li> <strong>pos_type pSeekoff(off_type offset, std::ios::seekdir way,
std::ios::openmode mode =
std::ios::in | std::ios::out)</strong>:<br>
With seekable streams, repositions the associated <strong>std::istream</strong>
or <strong>std::ostream</strong> is repositioned to offset <em>offset</em>, relative to
<em>way</em>.
<li> <strong>pos_type pSeekpos(off_type offset, std::ios::openmode mode =
std::ios::in | std::ios::out)</strong>:<br>
With seekable streams, repositions the associated <strong>std::istream</strong>
or <strong>std::ostream</strong> is repositioned to offset <em>offset</em>, relative to
the beginning of the stream.
<li> <strong>int pSync()</strong>:<br>
This member flushes the associated <strong>std::ostream</strong> object.
<li> <strong>std::streamsize pXsputn(char const *buffer, std::streamsize n)</strong>:<br>
This member inserts <em>n</em> characters from <em>buffer</em> into the
associated <strong>std::ostream</strong> stream.
</ul>
<p>
<h2>EXAMPLE</h2>
See the example provided with <strong>process</strong>(3bobcat).
<p>
<h2>FILES</h2>
<em>bobcat/iostreambuf</em> - defines the class interface
<p>
<h2>SEE ALSO</h2>
<strong>bobcat</strong>(7), <strong>iostream</strong>(3bobcat), <strong>process</strong>(3bobcat)
<p>
<h2>BUGS</h2>
None reported.
<p>
<h2>DISTRIBUTION FILES</h2>
<ul>
<li> <em>bobcat_3.23.01-x.dsc</em>: detached signature;
<li> <em>bobcat_3.23.01-x.tar.gz</em>: source archive;
<li> <em>bobcat_3.23.01-x_i386.changes</em>: change log;
<li> <em>libbobcat1_3.23.01-x_*.deb</em>: debian package holding the
libraries;
<li> <em>libbobcat1-dev_3.23.01-x_*.deb</em>: debian package holding the
libraries, headers and manual pages;
<li> <em>http://sourceforge.net/projects/bobcat</em>: public archive location;
</ul>
<p>
<h2>BOBCAT</h2>
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
<p>
<h2>COPYRIGHT</h2>
This is free software, distributed under the terms of the
GNU General Public License (GPL).
<p>
<h2>AUTHOR</h2>
Frank B. Brokken (<strong>f.b.brokken@rug.nl</strong>).
<p>
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