[#BloombergLP-bdld-DatumMapBuilder-2constructor-06]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdld.adoc[bdld]::xref:BloombergLP/bdld/DatumMapBuilder.adoc[DatumMapBuilder]::DatumMapBuilder
:relfileprefix: ../../../
:mrdocs:

Create a builder with the specified `initialCapacity`, optionally using the specified `allocator`&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
DatumMapBuilder(
    xref:BloombergLP/bdld/DatumMapBuilder/SizeType.adoc[SizeType] initialCapacity,
    xref:BloombergLP/bdld/DatumMapBuilder/allocator_type.adoc[allocator&lowbar;type] const& allocator = allocator&lowbar;type());
----


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