[#BloombergLP-bdlbb-Blob-prependDataBuffer-0b]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlbb.adoc[bdlbb]::xref:BloombergLP/bdlbb/Blob.adoc[Blob]::prependDataBuffer
:relfileprefix: ../../../
:mrdocs:

Insert the specified `buffer` before the beginning of this blob.

== Synopsis

Declared in `<bdlbb_blob.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
prependDataBuffer(xref:BloombergLP/bdlbb/BlobBuffer.adoc[BlobBuffer] const& buffer);
----

== Description

The length of this blob is incremented by the length of the prepended buffer. The behavior is undefined unless neither the total size of the resulting blob nor its total number of buffers exceeds `INT_MAX`. Note that this operation is equivalent to: ` const int n = blob.length(); blob.insertBuffer(0, buffer); blob.setLength(n + buffer.size()); ` but is more efficient.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *buffer*
| blob buffer to prepend as data
|===


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