[#BloombergLP-bdld-DatumMapOwningKeysBuilder-2constructor-01] = xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdld.adoc[bdld]::xref:BloombergLP/bdld/DatumMapOwningKeysBuilder.adoc[DatumMapOwningKeysBuilder]::DatumMapOwningKeysBuilder :relfileprefix: ../../../ :mrdocs: Create a `DatumMapOwningKeysBuilder` object that will administer the process of building a `Datum` map (owning keys) using the specified `allocator` (e.g., the address of a `bslma::Allocator` object) to supply memory. Note that no memory is allocated until `append` or `pushBack` methods are called on this object. == Synopsis Declared in `<bdld_datummapowningkeysbuilder.h>` [source,cpp,subs="verbatim,replacements,macros,-callouts"] ---- explicit DatumMapOwningKeysBuilder(xref:BloombergLP/bdld/DatumMapOwningKeysBuilder/allocator_type.adoc[allocator_type] const& allocator); ---- [.small]#Created with https://www.mrdocs.com[MrDocs]#