[#BloombergLP-bdlbb-Blob-2constructor-0ff]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlbb.adoc[bdlbb]::xref:BloombergLP/bdlbb/Blob.adoc[Blob]::Blob
:relfileprefix: ../../../
:mrdocs:

Create an empty blob having no factory to allocate blob buffers. Since there is no factory, the behavior is undefined if the length of the blob is set beyond the total size. Optionally specify a `basicAllocator` used to supply memory. If `basicAllocator` is 0, the currently installed default allocator is used.

== Synopsis

Declared in `<bdlbb_blob.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
Blob(xref:BloombergLP/bslma/Allocator.adoc[bslma::Allocator]* basicAllocator = 0);
----


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