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<title>Class Poco::UUID</title>
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<meta name="author" content="Applied Informatics Software Engineering GmbH and Contributors"/>
<meta name="publisher" content="Applied Informatics Software Engineering GmbH and Contributors"/>
<meta name="copyright" content="Copyright (c) 2009, Applied Informatics Software Engineering GmbH and Contributors"/>
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<meta name="date" content="2009-11-24"/>
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<div class="header">
<h1 class="namespace"><a href="Poco.html" class="namespace">Poco</a></h1>
<h1 class="symbol">class UUID</h1>
</div>
<div class="body">
<p>
<b>Library:</b> Foundation<br />
<b>Package:</b> UUID<br />
<b>Header:</b> Poco/UUID.h</p>
<h2>Description</h2>
<div class="description">
<p>A <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> is an identifier that is unique across both space and time, with respect to the space of all UUIDs. Since a <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> is a fixed size and contains a time field, it is possible for values to rollover (around A.D. 3400, depending on the specific algorithm used). A <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> can be used for multiple purposes, from tagging objects with an extremely short lifetime, to reliably identifying very persistent objects across a network. This class implements a Universal Unique Identifier, as specified in Appendix A of the DCE 1.1 Remote Procedure Call Specification (<a href="http://www.opengroup.org/onlinepubs/9629399/" target="_blank">http://www.opengroup.org/onlinepubs/9629399/</a>), <a href="http://www.ietf.org/rfc/rfc2518.txt" target="_blank">RFC 2518</a> (WebDAV), section 6.4.1 and the UUIDs and GUIDs internet draft by Leach/Salz from February, 1998 (<a href="http://ftp.ics.uci.edu/pub/ietf/webdav/uuid-guid/draft-leach-uuids-guids-01.txt" target="_blank">http://ftp.ics.uci.edu/pub/ietf/webdav/uuid-guid/draft-leach-uuids-guids-01.txt</a>) and also <a href="http://www.ietf.org/internet-drafts/draft-mealling-uuid-urn-03.txt" target="_blank">http://www.ietf.org/internet-drafts/draft-mealling-uuid-urn-03.txt</a> </p>
</div>
<h2>Member Summary</h2>
<p><b>Member Functions: </b><a href="Poco.UUID.html#11727" title="Poco::UUID::appendHex()">appendHex</a>, <a href="Poco.UUID.html#11725" title="Poco::UUID::compare()">compare</a>, <a href="Poco.UUID.html#11692" title="Poco::UUID::copyFrom()">copyFrom</a>, <a href="Poco.UUID.html#11694" title="Poco::UUID::copyTo()">copyTo</a>, <a href="Poco.UUID.html#11712" title="Poco::UUID::dns()">dns</a>, <a href="Poco.UUID.html#11738" title="Poco::UUID::fromNetwork()">fromNetwork</a>, <a href="Poco.UUID.html#11710" title="Poco::UUID::isNil()">isNil</a>, <a href="Poco.UUID.html#11736" title="Poco::UUID::nibble()">nibble</a>, <a href="Poco.UUID.html#11711" title="Poco::UUID::nil()">nil</a>, <a href="Poco.UUID.html#11714" title="Poco::UUID::oid()">oid</a>, <a href="Poco.UUID.html#11700" title="Poco::UUID::operator !=()">operator !=</a>, <a href="Poco.UUID.html#11702" title="Poco::UUID::operator <()">operator <</a>, <a href="Poco.UUID.html#11704" title="Poco::UUID::operator <=()">operator <=</a>, <a href="Poco.UUID.html#11685" title="Poco::UUID::operator =()">operator =</a>, <a href="Poco.UUID.html#11698" title="Poco::UUID::operator ==()">operator ==</a>, <a href="Poco.UUID.html#11706" title="Poco::UUID::operator >()">operator ></a>, <a href="Poco.UUID.html#11708" title="Poco::UUID::operator >=()">operator >=</a>, <a href="Poco.UUID.html#11689" title="Poco::UUID::parse()">parse</a>, <a href="Poco.UUID.html#11687" title="Poco::UUID::swap()">swap</a>, <a href="Poco.UUID.html#11739" title="Poco::UUID::toNetwork()">toNetwork</a>, <a href="Poco.UUID.html#11691" title="Poco::UUID::toString()">toString</a>, <a href="Poco.UUID.html#11713" title="Poco::UUID::uri()">uri</a>, <a href="Poco.UUID.html#11697" title="Poco::UUID::variant()">variant</a>, <a href="Poco.UUID.html#11696" title="Poco::UUID::version()">version</a>, <a href="Poco.UUID.html#11715" title="Poco::UUID::x500()">x500</a></p>
<h2>Enumerations</h2>
<h3><a name="11672">Version</a></h3>
<div class="description">
<p></p>
</div>
<p class="decl"><a name="11673">UUID_TIME_BASED</a> = 0x01</p>
<div class="description">
<p></p>
</div>
<p class="decl"><a name="11674">UUID_DCE_UID</a> = 0x02</p>
<div class="description">
<p></p>
</div>
<p class="decl"><a name="11675">UUID_NAME_BASED</a> = 0x03</p>
<div class="description">
<p></p>
</div>
<p class="decl"><a name="11676">UUID_RANDOM</a> = 0x04</p>
<div class="description">
<p></p>
</div>
<h2>Constructors</h2>
<h3><a name="11677">UUID</a></h3>
<p class="decl"><a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>();</p>
<div class="description">
<p>Creates a nil (all zero) <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>. </p>
</div>
<h3><a name="11678">UUID</a></h3>
<p class="decl"><a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>(<br /> const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uuid<br />);</p>
<div class="description">
<p>Copy constructor. </p>
</div>
<h3><a name="11680">UUID</a></h3>
<p class="decl">explicit <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>(<br /> const std::string & uuid<br />);</p>
<div class="description">
<p>Parses the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> from a string. </p>
</div>
<h3><a name="11682">UUID</a></h3>
<p class="decl">explicit <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>(<br /> const char * uuid<br />);</p>
<div class="description">
<p>Parses the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> from a string. </p>
</div>
<h3><a name="11722">UUID</a> <img src="images/protected.gif" alt="protected" title="protected" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl"><a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>(<br /> const char * bytes,<br /> <a href="Poco.UUID.html#11672" title="enum Poco::UUID::Version">Version</a> version<br />);</p>
<div class="description">
<p></p>
</div>
<h3><a name="11716">UUID</a> <img src="images/protected.gif" alt="protected" title="protected" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl"><a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>(<br /> <a href="Poco.html#11354" title="Poco::UInt32">UInt32</a> timeLow,<br /> <a href="Poco.html#11354" title="Poco::UInt32">UInt32</a> timeMid,<br /> <a href="Poco.html#11354" title="Poco::UInt32">UInt32</a> timeHiAndVersion,<br /> <a href="Poco.html#11352" title="Poco::UInt16">UInt16</a> clockSeq,<br /> <a href="Poco.html#11350" title="Poco::UInt8">UInt8</a> node[]<br />);</p>
<div class="description">
<p></p>
</div>
<h2>Destructor</h2>
<h3><a name="11684">~UUID</a></h3>
<p class="decl">~<a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>();</p>
<div class="description">
<p>Destroys the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>. </p>
</div>
<h2>Member Functions</h2>
<h3><a name="11692">copyFrom</a></h3>
<p class="decl">void copyFrom(<br /> const char * buffer<br />);</p>
<div class="description">
<p>Copies the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> (16 bytes) from a buffer or byte array. The <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> fields are expected to be stored in network byte order. The buffer need not be aligned. </p>
</div>
<h3><a name="11694">copyTo</a></h3>
<p class="decl">void copyTo(<br /> char * buffer<br />) const;</p>
<div class="description">
<p>Copies the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> to the buffer. The fields are in network byte order. The buffer need not be aligned. There must have room for at least 16 bytes. </p>
</div>
<h3><a name="11712">dns</a> <img src="images/static.gif" alt="static" title="static" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">static const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & dns();</p>
<div class="description">
<p>Returns the namespace identifier for the DNS namespace. </p>
</div>
<h3><a name="11710">isNil</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool isNil() const;</p>
<div class="description">
<p>Returns true if and only if the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> is nil (in other words, consists of all zeros). </p>
</div>
<h3><a name="11711">nil</a> <img src="images/static.gif" alt="static" title="static" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">static const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & nil();</p>
<div class="description">
<p>Returns a nil <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>. </p>
</div>
<h3><a name="11714">oid</a> <img src="images/static.gif" alt="static" title="static" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">static const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & oid();</p>
<div class="description">
<p>Returns the namespace identifier for the OID namespace. </p>
</div>
<h3><a name="11700">operator !=</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool operator != (<br /> const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uuid<br />) const;</p>
<div class="description">
<p></p>
</div>
<h3><a name="11702">operator <</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool operator < (<br /> const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uuid<br />) const;</p>
<div class="description">
<p></p>
</div>
<h3><a name="11704">operator <=</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool operator <= (<br /> const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uuid<br />) const;</p>
<div class="description">
<p></p>
</div>
<h3><a name="11685">operator =</a></h3>
<p class="decl"><a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & operator = (<br /> const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uuid<br />);</p>
<div class="description">
<p>Assignment operator. </p>
</div>
<h3><a name="11698">operator ==</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool operator == (<br /> const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uuid<br />) const;</p>
<div class="description">
<p></p>
</div>
<h3><a name="11706">operator ></a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool operator > (<br /> const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uuid<br />) const;</p>
<div class="description">
<p></p>
</div>
<h3><a name="11708">operator >=</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">bool operator >= (<br /> const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uuid<br />) const;</p>
<div class="description">
<p></p>
</div>
<h3><a name="11689">parse</a></h3>
<p class="decl">void parse(<br /> const std::string & uuid<br />);</p>
<div class="description">
<p>Parses the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> from its string representation. </p>
</div>
<h3><a name="11687">swap</a></h3>
<p class="decl">void swap(<br /> <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uuid<br />);</p>
<div class="description">
<p>Swaps the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> with another one. </p>
</div>
<h3><a name="11691">toString</a></h3>
<p class="decl">std::string toString() const;</p>
<div class="description">
<p>Returns a string representation of the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> consisting of groups of hexadecimal digits separated by hyphens. </p>
</div>
<h3><a name="11713">uri</a> <img src="images/static.gif" alt="static" title="static" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">static const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uri();</p>
<div class="description">
<p>Returns the namespace identifier for the <a href="Poco.URI.html" title="class Poco::URI">URI</a> (former URL) namespace. </p>
</div>
<h3><a name="11697">variant</a></h3>
<p class="decl">int variant() const;</p>
<div class="description">
<p>Returns the variant number of the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>: </p>
<ul>
<li>0 reserved for NCS backward compatibility </li>
<li>2 the Leach-Salz variant (used by this class) </li>
<li>6 reserved, Microsoft Corporation backward compatibility </li>
<li>7 reserved for future definition </li>
</ul>
</div>
<h3><a name="11696">version</a> <img src="images/inline.gif" alt="inline" title="inline" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl"><a href="Poco.UUID.html#11672" title="enum Poco::UUID::Version">Version</a> version() const;</p>
<div class="description">
<p>Returns the version of the <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a>. </p>
</div>
<h3><a name="11715">x500</a> <img src="images/static.gif" alt="static" title="static" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">static const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & x500();</p>
<div class="description">
<p>Returns the namespace identifier for the X500 namespace. </p>
</div>
<h3><a name="11727">appendHex</a> <img src="images/protected.gif" alt="protected" title="protected" style="vertical-align:baseline;" border="0" /> <img src="images/static.gif" alt="static" title="static" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">static void appendHex(<br /> std::string & str,<br /> <a href="Poco.html#11350" title="Poco::UInt8">UInt8</a> n<br />);</p>
<div class="description">
<p></p>
</div>
<h3><a name="11730">appendHex</a> <img src="images/protected.gif" alt="protected" title="protected" style="vertical-align:baseline;" border="0" /> <img src="images/static.gif" alt="static" title="static" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">static void appendHex(<br /> std::string & str,<br /> <a href="Poco.html#11352" title="Poco::UInt16">UInt16</a> n<br />);</p>
<div class="description">
<p></p>
</div>
<h3><a name="11733">appendHex</a> <img src="images/protected.gif" alt="protected" title="protected" style="vertical-align:baseline;" border="0" /> <img src="images/static.gif" alt="static" title="static" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">static void appendHex(<br /> std::string & str,<br /> <a href="Poco.html#11354" title="Poco::UInt32">UInt32</a> n<br />);</p>
<div class="description">
<p></p>
</div>
<h3><a name="11725">compare</a> <img src="images/protected.gif" alt="protected" title="protected" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">int compare(<br /> const <a href="Poco.UUID.html" title="class Poco::UUID">UUID</a> & uuid<br />) const;</p>
<div class="description">
<p></p>
</div>
<h3><a name="11738">fromNetwork</a> <img src="images/protected.gif" alt="protected" title="protected" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">void fromNetwork();</p>
<div class="description">
<p></p>
</div>
<h3><a name="11736">nibble</a> <img src="images/protected.gif" alt="protected" title="protected" style="vertical-align:baseline;" border="0" /> <img src="images/static.gif" alt="static" title="static" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">static <a href="Poco.html#11350" title="Poco::UInt8">UInt8</a> nibble(<br /> char hex<br />);</p>
<div class="description">
<p></p>
</div>
<h3><a name="11739">toNetwork</a> <img src="images/protected.gif" alt="protected" title="protected" style="vertical-align:baseline;" border="0" /> </h3>
<p class="decl">void toNetwork();</p>
<div class="description">
<p></p>
</div>
<p class="footer">POCO C++ Libraries 1.3.6-all<br />
Copyright © 2009, <a href="http://pocoproject.org/" target="_blank">Applied Informatics Software Engineering GmbH and Contributors</a></p>
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