[#BloombergLP-bdlat_ChoiceFunctions]
= xref:BloombergLP.adoc[BloombergLP]::bdlat_ChoiceFunctions
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This `namespace` provides functions that expose "choice" behavior for "choice" types. See the component‐level documentation for more information.

== Types

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlat_ChoiceFunctions/IsChoice-04.adoc[`IsChoice`] 
| This `struct` should be specialized for third‐party types that need to expose "choice" behavior. See the component‐level documentation for further information.
|===


== Enums

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlat_ChoiceFunctions/_04enum.adoc[`Unnamed enum`] 
| Compile‐time constants for choice selection identifiers.
|===


== Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlat_ChoiceFunctions/accessSelection.adoc[`accessSelection`] 
| Invoke the specified `accessor` on the (non‐modifiable) selection of the specified `object`, supplying `accessor` with the corresponding selection information structure. The supplied `accessor` must be a callable type that can be called as if it had the following signature: ` template <class t_INFO> int accessor(const SELECTION_TYPE& selection, const t_INFO& info); ` Return the value returned from the invocation of `accessor`. The behavior is undefined unless `k_UNDEFINED_SELECTION_ID != selectionId(object)`.
| xref:BloombergLP/bdlat_ChoiceFunctions/bdlat_choiceAccessSelection.adoc[`bdlat_choiceAccessSelection`] 
| Default customization‐point implementation of `accessSelection`.
| xref:BloombergLP/bdlat_ChoiceFunctions/bdlat_choiceHasSelection-07.adoc[`bdlat_choiceHasSelection`] 
| `bdlat_choiceHasSelection` overloads
| xref:BloombergLP/bdlat_ChoiceFunctions/bdlat_choiceMakeSelection-06d.adoc[`bdlat_choiceMakeSelection`] 
| `bdlat_choiceMakeSelection` overloads
| xref:BloombergLP/bdlat_ChoiceFunctions/bdlat_choiceManipulateSelection.adoc[`bdlat_choiceManipulateSelection`] 
| Default customization‐point implementation of `manipulateSelection`.
| xref:BloombergLP/bdlat_ChoiceFunctions/bdlat_choiceSelectionId.adoc[`bdlat_choiceSelectionId`] 
| Default customization‐point implementation of `selectionId`.
| xref:BloombergLP/bdlat_ChoiceFunctions/hasSelection-02.adoc[`hasSelection`] 
| `hasSelection` overloads
| xref:BloombergLP/bdlat_ChoiceFunctions/makeSelection-0d.adoc[`makeSelection`] 
| `makeSelection` overloads
| xref:BloombergLP/bdlat_ChoiceFunctions/manipulateSelection.adoc[`manipulateSelection`] 
| Invoke the specified `manipulator` on the address of the (modifiable) selection of the specified `object`, supplying `manipulator` with the corresponding selection information structure. The supplied `manipulator` must be a callable type that can be called as if it had the following signature: ` template <class t_INFO> int manipulator(SELECTION_TYPE *selection, const t_INFO& info); ` Return the value returned from the invocation of `manipulator`. The behavior is undefined unless `k_UNDEFINED_SELECTION_ID != selectionId(*object)`.
| xref:BloombergLP/bdlat_ChoiceFunctions/selectionId.adoc[`selectionId`] 
| Return the id of the current selection if the selection is defined, and k_UNDEFINED_SELECTION_ID otherwise.
|===



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