[#BloombergLP-bdld-operator_lshift-0b8]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdld.adoc[bdld]::operator&lt;&lt;
:relfileprefix: ../../
:mrdocs:

Write the specified `rhs` value to the specified output `stream` in the format shown below&colon; &grave; &lsqb; abc &equals; aa, pqr &equals; bb&rsqb;&hyphen; abc and pqr are key strings, while aa and bb are the result of invoking operator &apos;&lt;&lt;&apos; on the individual value elements in the map &grave; and return a reference to the modifiable `stream`&period; The function will have no effect if the `stream` is not valid&period;

== Synopsis

Declared in `&lt;bdld&lowbar;datum&period;h&gt;`

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


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