[#BloombergLP-bdlc-CompactedArray-reserveCapacity-03]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/CompactedArray.adoc[CompactedArray]::reserveCapacity
:relfileprefix: ../../../
:mrdocs:

Make the capacity of this array at least the specified `numElements`, assuming the number of unique elements in this array does not exceed the greater of the specified `numUniqueElements` and `uniqueLength()`&period; This method has no effect if the current capacity meets or exceeds the required capacity&period; The behavior is undefined unless `numUniqueElements &lt;&equals; numElements` and `0 &lt; numUniqueElements &verbar;&verbar; 0 &equals;&equals; numElements`&period;

== Synopsis

Declared in `&lt;bdlc&lowbar;compactedarray&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
reserveCapacity(
    std::size&lowbar;t numElements,
    std::size&lowbar;t numUniqueElements);
----


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