[#BloombergLP-bsls-UnspecifiedBool-08]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::xref:BloombergLP/bsls/UnspecifiedBool-03.adoc[UnspecifiedBool]<xref:BloombergLP/bslmt/TestUtil_Guard.adoc[TestUtil_Guard]>
:relfileprefix: ../../
:mrdocs:

This class provides a member, `d_member`, whose pointer‐to‐member may be used as an "unspecified boolean type" for implicit conversion operators.

== Synopsis

Declared in `<bsls_unspecifiedbool.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<>
class xref:BloombergLP/bsls/UnspecifiedBool-03.adoc[UnspecifiedBool]<xref:BloombergLP/bslmt/TestUtil_Guard.adoc[TestUtil_Guard]>;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bsls/UnspecifiedBool-08/BoolType.adoc[`BoolType`] 
| Alias of a distinct type that is implicitly convertible to `bool`, but does not promote to `int`.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bsls/UnspecifiedBool-08/falseValue.adoc[`falseValue`] 
| Return a value that converts to the `bool` value `false`.
| xref:BloombergLP/bsls/UnspecifiedBool-08/makeValue.adoc[`makeValue`] 
| Return a value that converts to the `bool` value `true` if the specified predicate is `true`, and the `bool` value `false` otherwise.
| xref:BloombergLP/bsls/UnspecifiedBool-08/trueValue.adoc[`trueValue`] 
| Return a value that converts to the `bool` value `true`.
|===



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