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

Namespace for datum types in the `bdl` package group.

== Types

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdld/Datum.adoc[`Datum`] 
| Space‐efficient discriminated union holding a scalar or aggregate of `Datum` values.
| xref:BloombergLP/bdld/DatumArrayBuilder.adoc[`DatumArrayBuilder`] 
| This `class` provides a mechanism to build a `Datum` object having an array value in an exception‐safe manner.
| xref:BloombergLP/bdld/DatumArrayRef.adoc[`DatumArrayRef`] 
| Read‐only view of an array of `Datum` values.
| xref:BloombergLP/bdld/DatumBinaryRef.adoc[`DatumBinaryRef`] 
| This class provides a type to represent a pointer to non‐modifiable binary data and an integral size value.
| xref:BloombergLP/bdld/DatumError.adoc[`DatumError`] 
| Value‐semantic type for an error code with an optional error message.
| xref:BloombergLP/bdld/DatumIntMapBuilder.adoc[`DatumIntMapBuilder`] 
| Mechanism to build a `Datum` object having an int‐map value.
| xref:BloombergLP/bdld/DatumIntMapEntry.adoc[`DatumIntMapEntry`] 
| This class represents an entry in a datum map keyed by string values.
| xref:BloombergLP/bdld/DatumIntMapRef.adoc[`DatumIntMapRef`] 
| Read‐only view of a map of `Datum` values keyed by integers.
| xref:BloombergLP/bdld/DatumMaker.adoc[`DatumMaker`] 
| This concrete mechanism class provides "sugar" for easily creating `bdld::Datum` objects for testing.
| xref:BloombergLP/bdld/DatumMapBuilder.adoc[`DatumMapBuilder`] 
| This `class` provides a mechanism to build a `Datum` object having a map value in an exception‐safe manner.
| xref:BloombergLP/bdld/DatumMapEntry.adoc[`DatumMapEntry`] 
| This class represents an entry in a datum map keyed by string values.
| xref:BloombergLP/bdld/DatumMapOwningKeysBuilder.adoc[`DatumMapOwningKeysBuilder`] 
| This `class` provides a mechanism to build a `Datum` object having a map (owning keys) value in an exception‐safe manner.
| xref:BloombergLP/bdld/DatumMapRef.adoc[`DatumMapRef`] 
| Read‐only view of a map of `Datum` values keyed by strings.
| xref:BloombergLP/bdld/DatumMutableArrayRef.adoc[`DatumMutableArrayRef`] 
| This class provides mutable access to a datum array.
| xref:BloombergLP/bdld/DatumMutableIntMapRef.adoc[`DatumMutableIntMapRef`] 
| This `class` provides a mutable access to a datum int‐map. The users of this class can assign to the individual elements and also change the size of the map.
| xref:BloombergLP/bdld/DatumMutableMapOwningKeysRef.adoc[`DatumMutableMapOwningKeysRef`] 
| Mutable view of a key‐owning datum map.
| xref:BloombergLP/bdld/DatumMutableMapRef.adoc[`DatumMutableMapRef`] 
| This `class` provides a mutable access to a datum map. The users of this class can assign to the individual elements and also change the size of the map.
| xref:BloombergLP/bdld/DatumUdt.adoc[`DatumUdt`] 
| This class provides a type to represent a pointer to an object of some user‐defined type and an integer value denoting what actual type is represented.
| xref:BloombergLP/bdld/DatumUtil.adoc[`DatumUtil`] 
| This struct serves as a namespace for utility functions that operate on `bdld::Datum` objects.
| xref:BloombergLP/bdld/Datum_Helpers.adoc[`Datum_Helpers`] 
| Helpers for loading and storing typed values within a buffer.
| xref:BloombergLP/bdld/Datum_IntMapHeader.adoc[`Datum_IntMapHeader`] 
| This component‐local class provides a layout of the meta‐information stored in front of the Datum int‐maps.
| xref:BloombergLP/bdld/Datum_MakeDependent.adoc[`Datum_MakeDependent`] 
| Metafunction that aliases its first template argument as `type`.
| xref:BloombergLP/bdld/Datum_MapHeader.adoc[`Datum_MapHeader`] 
| This component‐local class provides a layout of the meta‐information stored in front of the Datum maps.
| xref:BloombergLP/bdld/ManagedDatum.adoc[`ManagedDatum`] 
| This class implements a smart‐pointer‐like resource manager for a `Datum` object.
|===


== Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdld/hashAppend.adoc[`hashAppend`] 
| Incorporate the value of `datum` into `hashAlgorithm`.
| xref:BloombergLP/bdld/swap.adoc[`swap`] 
| Exchange the values of the specified `a` and `b` objects.
| xref:BloombergLP/bdld/operator_lshift-0cb.adoc[`operator<<`] 
| Stream insertion operators
| xref:BloombergLP/bdld/operator_eq-02.adoc[`operator==`] 
| Equality operators
| xref:BloombergLP/bdld/operator_not_eq-0ad.adoc[`operator!=`] 
| Inequality operators
| xref:BloombergLP/bdld/operator_lt-00.adoc[`operator<`] 
| Less‐than operators
| xref:BloombergLP/bdld/operator_le-0e.adoc[`operator<=`] 
| Less‐than‐or‐equal operators
| xref:BloombergLP/bdld/operator_gt-00.adoc[`operator>`] 
| Greater‐than operators
| xref:BloombergLP/bdld/operator_ge-0b9.adoc[`operator>=`] 
| Greater‐than‐or‐equal operators
|===



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