[#BloombergLP-bdld-Datum_MapHeader]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdld.adoc[bdld]::Datum_MapHeader
:relfileprefix: ../../
:mrdocs:

This component‐local class provides a layout of the meta‐information stored in front of the Datum maps.

== Synopsis

Declared in `<bdld_datum.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct Datum_MapHeader;
----

== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdld/Datum_MapHeader/d_allocatedSize.adoc[`d_allocatedSize`] 
| Full allocated memory size in bytes.
| xref:BloombergLP/bdld/Datum_MapHeader/d_capacity.adoc[`d_capacity`] 
| Number of allocated map entries.
| xref:BloombergLP/bdld/Datum_MapHeader/d_ownsKeys.adoc[`d_ownsKeys`] 
| Flag indicating whether the map owns its keys.
| xref:BloombergLP/bdld/Datum_MapHeader/d_size.adoc[`d_size`] 
| Size of the map.
| xref:BloombergLP/bdld/Datum_MapHeader/d_sorted.adoc[`d_sorted`] 
| Flag indicating whether the map is sorted.
|===



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