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


<p>
<h2>NAME</h2>FBB::MultiStreambuf - Selectively writes multiple streams
<p>
<h2>SYNOPSIS</h2>
    <strong>#include &lt;bobcat/multistreambuf&gt;</strong><br>
    Linking option: <em>-lbobcat</em> 
<p>
<h2>DESCRIPTION</h2>
    The <strong>FBB::MultiStreambuf</strong> class is a specialization of
<strong>std::streambuf</strong>. It can be used to write selectvely to multiple
<strong>std::ostreams</strong>. Each <strong>std::ostream</strong> that is associated with an
<strong>FBB::MultiStreambuf</strong> is given a mode-tag indicating whether the stream
should always be used when information is inserted into the
<strong>FBB::MultiStreambuf</strong>, just once, or not at all. Each of the stream's 
mode-tags may be set to any of the defined tag-values. 
<p>
When the address of a <strong>FBB::MultiStreambuf</strong> is used to initialize a
<strong>std::ostream</strong> the constructed <strong>std::ostream</strong> becomes an
output-multiplexer: by inserting information into the <strong>std::ostream</strong> object,
all <strong>std::ostream</strong> objects added to its <strong>FBB::MultiStreambuf</strong> buffer which
have an active mode will receive that information.
<p>
An <strong>FBB::MultiStreambuf</strong> object should be outlived by all active streams
that are associated with it.
<p>
No assumptions should be made about the order in which the <strong>std::ostream</strong>
objects that are associated with the <strong>FBB::MultiStreambuf</strong> objects are
visited when information is inserted.
<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>
    In the <strong>Mode</strong> enumeration the following values are defined:
    <ul>
    <li> <strong>OFF</strong>:<br>
        A <strong>std::ostream</strong> having this mode will not be used when information
is inserted into an <strong>FBB::MultiStreambuf</strong>
    <li> <strong>ON</strong>:<br>
        A <strong>std::ostream</strong> having this mode will be used when information
is inserted into an <strong>FBB::MultiStreambuf</strong>
    <li> <strong>ONCE</strong>:<br>
        A <strong>std::ostream</strong> having this mode will be used once, until the next
flushing operation, when information is inserted into an
<strong>FBB::MultiStreambuf</strong>
    <li> <strong>RESET</strong>:<br>
        A <strong>std::ostream</strong> having this mode will not be used when information
is inserted into an <strong>FBB::MultiStreambuf</strong>. At a flush operation all <strong>ONCE</strong>
modes will be set to <strong>RESET</strong>
    </ul>
<p>
<h2>TYPES</h2>
    The following subtypes are defined in the class <strong>FBB:MultiStreambuf</strong>:
    <ul>
    <li> <strong>iterator</strong>:<br>
        This is a synonym of <strong>std::vector&lt;stream&gt;::iterator</strong>
    <li> <strong>const_iterator</strong>:<br>
        This is a synonym of <strong>std::vector&lt;stream&gt;::const_iterator</strong>
    </ul>
<p>
<h2>NESTED CLASS</h2>
    The class <strong>FBB::MultiStreambuf::stream</strong> is defined as a nested class of
<strong>FBB::MultiStreambuf</strong>. It offers the following constructor and public
members: 
    <ul>
    <li> <strong>stream(std::ostream &amp;os, Mode mode = ON)</strong>:<br>
        The constructor stores a <strong>std::ostream</strong> object, and associates a
<strong>Mode</strong> value with it.
    <li> <strong>void setMode(Mode mode)</strong>:<br>
        This member is used to redefine the <strong>stream</strong>'s  <strong>Mode</strong> value.
    <li> <strong>void mode() const</strong>:<br>
        This member returns the  <strong>stream</strong>'s  <strong>Mode</strong> value.
    <li> <strong>operator std::ostream &amp;()</strong>:<br>
        This member returns the  <strong>stream</strong>'s  <strong>std::ostream</strong>.
    </ul>    
<p>
<h2>CONSTRUCTORS</h2>
    <ul>
    <li> <strong>MultiStreambuf()</strong>:<br>
        The default constructor creates a <strong>FBB::MultiStreambuf</strong> object which
contains no associated <strong>std::ostream</strong> objects.
    <li> <strong>MultiStreambuf(std::ostream &amp;os, Mode mode = ON)</strong>:<br>
        This constructor creates a <strong>FBB::MultiStreambuf</strong> object which
is immediately associated with the <strong>std::ostream</strong> specified as its first
argument. 
    <li> <strong>MultiStreambuf(std::vector&lt;MultiStreambuf::stream&gt; const &amp;osvector)</strong>:<br>
        This constructor creates a <strong>FBB::MultiStreambuf</strong> object which is
immediately associated with all <strong>std::ostream</strong> objects that are stored in
the <strong>MultiStreambuf::stream</strong> elements of the specified vector.
    </ul>
    The copy constructor is available.
<p>
<h2>MEMBER FUNCTIONS</h2>
     All members of <strong>std::ostringstream</strong> and <strong>std::exception</strong> are
available, as <strong>FBB::MultiStreambuf</strong> inherits from these classes.
    <ul>
    <li> <strong>iterator begin()</strong>:<br>
        This member returns an iterator to the first <strong>stream</strong> element that
is stored in a <strong>FBB::MultiStreambuf</strong> object.
    <li> <strong>const_iterator begin()</strong>:<br>
        This member returns an iterator to the first (unmodifiable) <strong>stream</strong>
element that is stored in a <strong>FBB::MultiStreambuf</strong> object.
    <li> <strong>iterator end()</strong>:<br>
        This member returns an iterator pointing beyond the last <strong>stream</strong>
element that is stored in a <strong>FBB::MultiStreambuf</strong> object.
    <li> <strong>iterator end()</strong>:<br>
        This member returns an iterator pointing beyond the last
(unmodifiable) <strong>stream</strong> element that is stored in a <strong>FBB::MultiStreambuf</strong>
object.
    <li> <strong>void insert(std::ostream &amp;os, Mode mode = ON)</strong>:<br>
        This member adds the specified <strong>std::ostream</strong> using the specified
<strong>Mode</strong> to the current set of <strong>stream</strong> objects.
    <li> <strong>void insert(std::vector&lt;stream&gt; const &amp;os)</strong>:<br>
        This member adds all <strong>stream</strong> objects stored in the <strong>os</strong> vector to
the current set of <strong>stream</strong> objects.
    <li> <strong>void void setOnce()</strong>:<br>
        This member will reset all the <em>RESET</em> <strong>Mode</strong> values of the stored
<strong>stream</strong> objects to <em>ONCE</em>.
    </ul>
<p>
<h2>PROTECTED MEMBER FUNCTION</h2>
<p>
The member listed in this section implements the tasks of the comparably
named virtual function in the class's private interface. This separates the
redefinable interface from the user-interface. The class <strong>MultiStreamBuf</strong>
can, in accordance with Liskov's Substitution Principle, be used as a
<em>std:streambuf</em>; but it also offers a facility for classes deriving from
<strong>MultiStreamBuf</strong>. This facility is listed here.
    <ul>
    <li> <strong>int pSync()</strong>:<br>
        The contents of the <strong>MultiStreamBuf</strong>'s internal buffer is written to
each of the <em>std::ostream</em> objects to which the <strong>MultiStreamBuf</strong> object
has access.
    </ul>
<p>
<h2>EXAMPLE</h2>
    <pre>

#include &lt;iostream&gt;
#include &lt;fstream&gt;
#include &lt;bobcat/multistreambuf&gt;

using namespace std;
using namespace FBB;

int main()
{
    MultiStreambuf  msb(cout);
    ostream         os(&amp;msb);
    ofstream        out("out");

    msb.insert(out, MultiStreambuf::ONCE);

    os &lt;&lt; "This is on cout and out" &lt;&lt; endl;
    os &lt;&lt; "This is on cout only" &lt;&lt; endl;

    msb.setOnce();
    os &lt;&lt; "This is on cout and out" &lt;&lt; endl;
    os &lt;&lt; "This is on cout only" &lt;&lt; endl;

    return 0;
}
    
</pre>

<p>
<h2>FILES</h2>
    <em>bobcat/multistreambuf</em> - defines the class interface
<p>
<h2>SEE ALSO</h2>
    <strong>bobcat</strong>(7)
<p>
<h2>BUGS</h2>
    None Reported.
<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>

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