[#BloombergLP-bdlb-GuidUtil]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::GuidUtil
:relfileprefix: ../../
:mrdocs:

This `struct` provides a namespace for functions that create Universally Unique Identifiers per RFC 4122 (http://www.ietf.org/rfc/rfc4122.txt).

== Synopsis

Declared in `<bdlb_guidutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct GuidUtil;
----

== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlb/GuidUtil/dnsNamespace.adoc[`dnsNamespace`] 
| Return the pre‐defined namespace ID for the DNS namespace from Appendix C of RFC 4122, for use with the `generateFromName` method when the name string is a fully‐qualified domain name.
| xref:BloombergLP/bdlb/GuidUtil/generate-07.adoc[`generate`] 
| `generate` overloads
| xref:BloombergLP/bdlb/GuidUtil/generateFromName.adoc[`generateFromName`] 
| Generate and return a single GUID meeting the RFC 4122 version 5 specification from the specified `namespaceId` and `name`. `namespaceId` may (but need not) be one of the pre‐defined namespace IDs. Note that this method is a pure function of its arguments.
| xref:BloombergLP/bdlb/GuidUtil/generateNonSecure-0e.adoc[`generateNonSecure`] 
| `generateNonSecure` overloads
| xref:BloombergLP/bdlb/GuidUtil/getLeastSignificantBits.adoc[`getLeastSignificantBits`] 
| Return the least significant 8 bytes of the specified `guid`.
| xref:BloombergLP/bdlb/GuidUtil/getMostSignificantBits.adoc[`getMostSignificantBits`] 
| Return the most significant 8 bytes of the specified `guid`.
| xref:BloombergLP/bdlb/GuidUtil/getVersion.adoc[`getVersion`] 
| Return the version of the specified `guid` object. The behavior is undefined unless the contents of the `guid` object are compliant with RFC 4122.
| xref:BloombergLP/bdlb/GuidUtil/guidFromString-0d.adoc[`guidFromString`] 
| `guidFromString` overloads
| xref:BloombergLP/bdlb/GuidUtil/guidToString-02.adoc[`guidToString`] 
| `guidToString` overloads
| xref:BloombergLP/bdlb/GuidUtil/oidNamespace.adoc[`oidNamespace`] 
| Return the pre‐defined namespace ID for the OID namespace from Appendix C of RFC 4122, for use with the `generateFromName` method when the name string is an ISO Object ID (OID).
| xref:BloombergLP/bdlb/GuidUtil/urlNamespace.adoc[`urlNamespace`] 
| Return the pre‐defined namespace ID for the URL namespace from Appendix C of RFC 4122, for use with the `generateFromName` method when the name string is a URL.
| xref:BloombergLP/bdlb/GuidUtil/x500Namespace.adoc[`x500Namespace`] 
| Return the pre‐defined namespace ID for the X500 namespace from Appendix C of RFC 4122, for use with the `generateFromName` method when the name string is an X.500 Distinguished Name.
|===



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