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<title>PTypes: streams: logfile</title>
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<p><a href="../index.html"><img src="title-21.png" width="253" height="39" alt="C++ Portable Types Library (PTypes) Version 2.1" border="0"></a>
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<p class="hpath"><a href="index.html">Top</a>: <a href="streams.html">Streams</a>:
logfile </p>
<blockquote>
<pre class="lang">#include <pstreams.h>
class logfile: outfile {
logfile( [ const string& filename, bool append = true ] );
void putf(const char* fmt, ...);
}
</pre>
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<p> The <span class="lang">lofgile</span> class inherits all public methods and
properties from <a href="streams.outfile.html">outfile</a>, but differs in the
following:</p>
<ul>
<li>The <span class="lang">append</span> property is set to <span class="lang">true</span>
by default.</li>
<li>The buffer size is set to 0 by default.</li>
<li>The <span class="lang">logfile::putf()</span> function is thread-safe: you
can call this function for the same logfile object from concurrent threads.</li>
</ul>
<p><span class="def">logfile::logfile( [ const string& filename, bool append
= true ] )</span> creates an output file stream, but does not open the file. When
opening a file with <span class="lang">open()</span>, the file pointer is positioned
at the end of the file, unless <span class="lang">append</span> is set to <span class="lang">false</span>.
<span class="lang">Filename</span> and <span class="lang">append</span> parameters
are optional.</p>
<p><span class="def">void logfile::putf(const char* fmt, ...)</span> is a thread-safe
version of <span class="lang">outstm::putf()</span>.</p>
<p class="seealso">See also: <a href="streams.iobase.html">iobase</a>, <a href="streams.outstm.html">outstm</a>,
<a href="streams.outfile.html">outfile</a>, <a href="streams.examples.html">Examples</a></p>
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