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<html><head>
<title>FBB::IFdStreambuf</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::IFdStreambuf</h1>
<h2>libbobcat-dev_3.19.01-x.tar.gz</h2>
<h2>2005-2013</h2>

<html><head>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1></h1>

<html><head>
<title>FBB::IFdStreambuf(3bobcat)</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::IFdStreambuf(3bobcat)</h1>
<h2>libbobcat-dev_3.19.01-x.tar.gz File Descriptor Input Stream Buffer</h2>
<h2>2005-2013</h2>


<p>
<h2>NAME</h2>FBB::IFdStreambuf - Input stream buffer initialized by a file descriptor
<p>
<h2>SYNOPSIS</h2>
    <strong>#include &lt;bobcat/ifdstreambuf&gt;</strong><br>
    Linking option: <em>-lbobcat</em> 
<p>
<h2>DESCRIPTION</h2>
    <strong>FBB::IFdStreambuf</strong> objects may be used as a <strong>std::streambuf</strong> of
<em>std::istream</em> objects to allow extractions from a file descriptor.
<p>
File descriptors are not defined within the context of <strong>C++</strong>,
but they can be used on operating systems that support the concept. Realize
that using file descriptors introduces operating system dependencies.
<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>ENUMERATION</h2>
    The public enumeration <strong>Mode</strong> defined in the class <strong>FBB::IFdStreamBuf</strong>
has the following values:
    <ul>
    <li> <strong>CLOSE_FD</strong>, indicating that the file descriptor used by the object
must be closed;
    <li> <strong>KEEP_FD</strong> (the default) indicating that the file descriptor used by
the object must not be closed.
    </ul>
<p>
<h2>CONSTRUCTORS</h2>
    <ul>
    <li> <strong>Ifdstreambuf()</strong>:<br>
        This constructor initializes the streambuf, without associating it to
a file descriptor, and without using buffering. The member <strong>open()</strong> can be
used subsequently to associate the object with a file descriptor and
optionally a buffer size. When the object is destroyed or if the mode-less
overloaded version of the <strong>open</strong> member is called, the file descriptor will
not be closed.
<p>
<li> <strong>Ifdstreambuf(Mode mode)</strong>:<br>
        This constructor initializes the streambuf, without associating it to
a file descriptor, and without using buffering. The member <strong>open()</strong> can be
used subsequently to associate the object with a file descriptor and
optionally a buffer size. When the object is destroyed or if the mode-less
overloaded version of the <strong>open</strong> member is called, the <strong>Mode</strong> argument
determines whether the file descriptor will be closed or will remain open.
<p>
<li> <strong>IFdStreambuf(int fd, size_t n = 1)</strong>:<br>
        This constructor initializes the streambuf, associating it to file
descriptor <em>fd</em>, and an optional unget buffer size (by default having size
1).  When the object is destroyed or if the mode-less overloaded version of
the <strong>open</strong> member is called, the file descriptor will not be closed.
<p>
<li> <strong>IFdStreambuf(int fd, Mode mode, size_t n = 1)</strong>:<br>
        This constructor initializes the streambuf, associating it to file
descriptor <em>fd</em>, and an optional unget buffer size (by default having size
1).   When the object is destroyed or if the mode-less
overloaded version of the <strong>open</strong> member is called, the <strong>Mode</strong> argument
determines whether the file descriptor will be closed or will remain open.
    </ul>
    There is no copy constructor.
<p>
<h2>MEMBER FUNCTIONS</h2>
     All members of <strong>std::streambuf</strong> are
available, as <strong>FBB::IFdStreambuf</strong> inherits from this class. Some of the
<strong>std::streambuf</strong>'s member are overridden by <strong>FBB::IFdStreambuf</strong>, see
below. 
    <ul>
    <li> <strong>void close()</strong>:<br>
        The file descriptor used by the <em>IFdStreambuf</em> is closed,
irrespective of the <em>Mode</em> that was specified when the <em>IFdStreambuf</em>
object was constructed. Following <em>close</em> the <em>IFdStreambuf</em> object can
no longer be used until one of its <em>open</em> members has been called.
    <li> <strong>int fd() const</strong>:<br>
        The file descriptor used by the <em>IFdStreambuf</em> object is returned.
        If the <em>OFdStreambuf</em> is not associated with a file descriptor -1 is
        returned. 
    <li> <strong>void open(int xfd, size_t n = 1)</strong>:<br>
        The streambuf is (re)initialized, using file descriptor <em>fd</em>, and an
optional unget buffer size (by default having size 1). When called repeatedly,
the <strong>Mode</strong> specification used whem the object was constructed determines
whether the file descriptor will be closed or will remain open.
    <li> <strong>void open(int xfd, Mode mode, size_t n = 1)</strong>:<br>
        The streambuf is (re)initialized, using file descriptor <em>fd</em>, a file
descriptor closing parameter and an optional unget buffer size (by default
having size 1). Depending on the <strong>Mode</strong> argument the object's currently used
file descriptor will be closed or will remain open when the <em>IFdStreambuf</em>
object is destroyed.
    </ul>
<p>
Note that there is no overloaded assignment operator available for this
class. 
<p>
<h2>EXAMPLE</h2>
    To do
<p>
<h2>FILES</h2>
    <em>bobcat/ifdstreambuf</em> - defines the class interface
<p>
<h2>SEE ALSO</h2>
    <strong>bobcat</strong>(7), <strong>ifdstream</strong>(3bobcat), <strong>ofdstreambuf</strong>(3bobcat), 
    <strong>std::streambuf</strong>
<p>
<h2>BUGS</h2>
    The member <em>xsgetn(char *dest, std::streamsize n)</em> will set
<em>istream::good()</em> to <em>false</em> when fewer bytes than <em>n</em> were read using
<em>istream::read()</em>. Also see <em>xsgetn</em>'s description.
<p>
Note that by default the provided file descriptors remain open. The
complementary class <strong>ofdstreambuf</strong>(3bobcat) <em>closes</em> the file descriptor
by default. This inconsistency was deliberately accepted to keep the classes
interfaces backward compatible.
<p>

<h2>DISTRIBUTION FILES</h2>
    <ul>
    <li> <em>bobcat_3.19.01-x.dsc</em>: detached signature;
    <li> <em>bobcat_3.19.01-x.tar.gz</em>: source archive;
    <li> <em>bobcat_3.19.01-x_i386.changes</em>: change log;
    <li> <em>libbobcat1_3.19.01-x_*.deb</em>: debian package holding the
            libraries;
    <li> <em>libbobcat1-dev_3.19.01-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>