[#BloombergLP-bdlc-operator_lshift-0688]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::operator<<
:relfileprefix: ../../
:mrdocs:

Return the value of the specified `array` left‐shifted by the specified `numBits` positions, having filled the lower‐index positions with zeros. The behavior is undefined unless `numBits <= array.length()`. Note that the length of the result equals the length of the original array, and that the highest‐order `numBits` are discarded in the result.

== Synopsis

Declared in `<bdlc_bitarray.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlc/BitArray.adoc[bdlc::BitArray]
operator<<(
    xref:BloombergLP/bdlc/BitArray.adoc[BitArray] const& array,
    std::size_t numBits);
----


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