[#BloombergLP-bdlc-operator_lshift-0c]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::operator<<
:relfileprefix: ../../
:mrdocs:

Write the value of the specified `set` to the specified output `stream` in a single‐line format, and return a reference providing modifiable access to `stream`. If `stream` is not valid on entry, this operation has no effect. Note that this human‐readable format is not fully specified and can change without notice.

== Synopsis

Declared in `<bdlc_flathashset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class KEY,
    class HASH,
    class EQUAL>
std::ostream&
operator<<(
    std::ostream& stream,
    xref:BloombergLP/bdlc/FlatHashSet.adoc[FlatHashSet<KEY, HASH, EQUAL>] const& set);
----


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