[#BloombergLP-bdlb-ConstNullableValueRef-2conversion] = xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/ConstNullableValueRef.adoc[ConstNullableValueRef]::operator bool :relfileprefix: ../../../ :mrdocs: Return `true` if the target holds a value, and `false` otherwise. == Synopsis Declared in `<bdlb_nullablevalueref.h>` [source,cpp,subs="verbatim,replacements,macros,-callouts"] ---- explicit operator bool() const noexcept; ---- [.small]#Created with https://www.mrdocs.com[MrDocs]#