[#BloombergLP-bslma-BufferAllocator-2constructor-0fc]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslma.adoc[bslma]::xref:BloombergLP/bslma/BufferAllocator.adoc[BufferAllocator]::BufferAllocator
:relfileprefix: ../../../
:mrdocs:

Create a buffer allocator that allocates from the specified `buffer`.

== Synopsis

Declared in `<bslma_bufferallocator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
BufferAllocator(
    char* buffer,
    xref:BloombergLP/bslma/Allocator/size_type.adoc[size_type] bufSize,
    xref:BloombergLP/bslma/BufferAllocator/AllocCallback.adoc[AllocCallback] allocCallback = 0);
----

== Description

Create a buffer allocator for allocating memory blocks from the specified `buffer` of the specified `bufSize`. Optionally specify a callback function `allocCallback` that is invoked when a call to `allocate` cannot be fulfilled from `buffer`. Note that maximum alignment is used when allocating memory.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *buffer*
| Memory buffer from which to allocate.
| *bufSize*
| Size (in bytes) of `buffer`.
| *allocCallback*
| Optional callback invoked when allocation fails.
|===


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