[#BloombergLP-bdlar-NullableValueConstRef-2constructor-048]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlar.adoc[bdlar]::xref:BloombergLP/bdlar/NullableValueConstRef.adoc[NullableValueConstRef]::NullableValueConstRef
:relfileprefix: ../../../
:mrdocs:

Constructors

== Synopses

Declared in `<bdlar_nullablevalueref.h>`

Create `NullableValueConstRef` object that wraps the same object as the specified `object`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlar/NullableValueConstRef/2constructor-03.adoc[NullableValueConstRef](xref:BloombergLP/bdlar/NullableValueRef.adoc[NullableValueRef] const& object);
----

[.small]#xref:BloombergLP/bdlar/NullableValueConstRef/2constructor-03.adoc[_» more..._]#

Create a const reference that type‐erases `nullable`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class t_NULLABLE>
explicit
xref:BloombergLP/bdlar/NullableValueConstRef/2constructor-046.adoc[NullableValueConstRef](t_NULLABLE const& nullable)
requires IsNullable<t_NULLABLE>::value;
----

[.small]#xref:BloombergLP/bdlar/NullableValueConstRef/2constructor-046.adoc[_» more..._]#

Create `NullableValueConstRef` object. The behaviour is undefined unless `objectAddress` and `vtable` point to the valid objects.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlar/NullableValueConstRef/2constructor-00.adoc[NullableValueConstRef](
    void const* objectAddress,
    xref:BloombergLP/bdlar/NullableValueConstVtable.adoc[NullableValueConstVtable] const* vtable);
----

[.small]#xref:BloombergLP/bdlar/NullableValueConstRef/2constructor-00.adoc[_» more..._]#

== Parameters

[cols="1,4"]
|===
| Name| Description
| *object*
| non‐const nullable‐value reference to rewrap as const
| *nullable*
| nullable value object to wrap
| *objectAddress*
| address of the nullable‐value object to wrap
| *vtable*
| pointer to the const vtable for the nullable‐value type
|===


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