[#BloombergLP-bdlma-MemoryBlockDescriptor-isNull]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlma.adoc[bdlma]::xref:BloombergLP/bdlma/MemoryBlockDescriptor.adoc[MemoryBlockDescriptor]::isNull
:relfileprefix: ../../../
:mrdocs:

Return `true` if this memory block descriptor describes a null memory block and `false` otherwise. A null memory block has an address and size of 0.

== Synopsis

Declared in `<bdlma_memoryblockdescriptor.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
isNull() const;
----


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