[#BloombergLP-bdld-operator_lshift-05a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdld.adoc[bdld]::operator<<
:relfileprefix: ../../
:mrdocs:

Write the value of the specified `rhs` object to the specified output `stream` in a single‐line format, and return a reference to the modifyable `stream`. If `stream` is not valid on entry, this operation has no effect. Note that this human‐readable format is not fully specified, can change without notice, and is logically equivalent to: ` print(stream, 0, ‐1); ` Single line output format for the `DatumUdt` object is shown below: ` user‐defined(<address>,type) ` (where `address` is hex value of the pointer to the user‐define object and `type` is the type of the user‐defined object)

== Synopsis

Declared in `<bdld_datumudt.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::ostream&
operator<<(
    std::ostream& stream,
    xref:BloombergLP/bdld/DatumUdt.adoc[DatumUdt] const& rhs);
----


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