[#BloombergLP-bdljsn-JsonNull-0b]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdljsn.adoc[bdljsn]::JsonNull
:relfileprefix: ../../
:mrdocs:

This type represents the JSON null value. There is only 1 value of this type, so all objects compare equal, hash to the same value, etc.

== Synopsis

Declared in `<bdljsn_jsonnull.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class JsonNull;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdljsn/JsonNull-0b/print.adoc[`print`] 
| Write "null" to the specified output `stream`, and return a reference to `stream`. Optionally specify an initial indentation `level`, whose absolute value is incremented recursively for nested objects. If `level` is specified, optionally specify `spacesPerLevel`, whose absolute value indicates the number of spaces per indentation level for this and all of its nested objects. If `level` is negative, suppress indentation of the first line. If `spacesPerLevel` is negative, format the entire output on one line, suppressing all but the initial indentation (as governed by `level`).
|===


== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdljsn/operator_not_eq-0c5.adoc[`operator!=`]
| Same as the related overload above for `operator!=`.
| xref:BloombergLP/bdljsn/operator_not_eq-0df.adoc[`operator!=`]
| Return `false` (unconditionally) as the specified `lhs` and `rhs` cannot have the different values.
| xref:BloombergLP/bdljsn/operator_eq-032.adoc[`operator==`]
| Return `true` (unconditionally) as the specified `lhs` and `rhs` must have the same value.
| xref:BloombergLP/bdljsn/operator_eq-0ac.adoc[`operator==`]
| Same as the related overload above for `operator==`.
| xref:BloombergLP/bdljsn/swap-03c.adoc[`swap`]
| Exchange the values of the specified `a` and `b` objects. This exception provides the no‐throw exception‐safety guarantee. Note that, since `a` and `b` have the same value (a class invariant), this operation is a no‐op.
|===


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