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

Utility for printing `bsl::optional` to standard output streams. This class has `operator<<` defined for it, so it can be used, for example, in `ball` logs.

== Synopsis

Declared in `<bdlb_optionalprinter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class TYPE>
class OptionalPrinter;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlb/OptionalPrinter/2constructor.adoc[`OptionalPrinter`]         [.small]#[constructor]#
| Create `OptionalPrinter` with the specified `data`.
| xref:BloombergLP/bdlb/OptionalPrinter/print.adoc[`print`] 
| Format this object to the specified output `stream` at the (absolute value of) the optionally specified indentation `level` and return a reference to `stream`. If `level` is specified, optionally specify `spacesPerLevel`, 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`). If `stream` is not valid on entry, this operation has no effect.
| xref:BloombergLP/bdlb/OptionalPrinter/2conversion.adoc[`operator BloombergLP::bslmf::NestedTraitDeclaration<OptionalPrinter, EnableStreamedFormatter>`] 
| Declare that this type enables the streamed formatter.
|===



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