[#BloombergLP-bdljsn-Json-2constructor-0bf4]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdljsn.adoc[bdljsn]::xref:BloombergLP/bdljsn/Json.adoc[Json]::Json
:relfileprefix: ../../../
:mrdocs:

Create a `Json` object holding `JsonNull` using `basicAllocator`.

== Synopsis

Declared in `<bdljsn_json.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
Json(xref:BloombergLP/bslma/Allocator.adoc[bslma::Allocator]* basicAllocator);
----

== Description

Create a `Json` object having the type (and the singleton value) of `JsonNull`. Use the specified `basicAllocator` to supply memory. If `basicAllocator` is 0, the currently installed default allocator is used to supply memory.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *basicAllocator*
| memory allocator; null uses the default
|===


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