[#BloombergLP-bslstl-Optional_ConvertibleToBool]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Optional&lowbar;ConvertibleToBool
:relfileprefix: ../../
:mrdocs:

Component&hyphen;private concept modeling the exposition&hyphen;only `boolean&hyphen;testable` concept&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;optional&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;class t&lowbar;TYPE&gt;
concept Optional&lowbar;ConvertibleToBool = bsl&colon;&colon;is&lowbar;convertible&lowbar;v&lt;t&lowbar;TYPE, bool&gt;;
----


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