Return whether the target does not contain a value.
Synopsis
Declared in <bdlb_nullablevalueref.h>
bool
isNull() const noexcept;Description
Return false if the target contains a value, and true otherwise. Note that this accessor is provided purely for compatibility with NullableValue and NullableAllocatedValue, and its use is discouraged in favor of has_value.
Return Value
false if the target contains a value, and true otherwise
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