[#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.

== Synopsis

Declared in `<bdlbb_blob.h>`

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

== Description

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.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *basicAllocator*
| allocator used to supply memory
|===


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