[#BloombergLP-bdld-DatumMapBuilder-2constructor-02]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdld.adoc[bdld]::xref:BloombergLP/bdld/DatumMapBuilder.adoc[DatumMapBuilder]::DatumMapBuilder
:relfileprefix: ../../../
:mrdocs:

Create a builder for a `Datum` map&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
DatumMapBuilder();
----

== Description

Optionally specify an `initialCapacity` for the map&period; If `initialCapacity` is not supplied, the initial capacity of the map is 0&period; Optionally specify an `allocator` (e&period;g&period;, the address of a `bslma&colon;&colon;Allocator` object) to supply memory&semi; otherwise, the default allocator is used&period;


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