[#BloombergLP-ball-operator_lshift-0cf3]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::operator&lt;&lt;
:relfileprefix: ../../
:mrdocs:

Write the value of the specified `rule` to the specified `output` stream&period; Return the specified `output` stream&period;

== Synopsis

Declared in `&lt;ball&lowbar;rule&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::ostream&
operator&lt;&lt;(
    std::ostream& output,
    xref:BloombergLP/ball/Rule.adoc[Rule] const& rule);
----

== Return Value

reference to `output`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *output*
| output stream
| *rule*
| rule to write
|===


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