[#BloombergLP-bslma-SequentialAllocator-2constructor-0e2]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslma.adoc[bslma]::xref:BloombergLP/bslma/SequentialAllocator.adoc[SequentialAllocator]::SequentialAllocator
:relfileprefix: ../../../
:mrdocs:

Create a sequential allocator using the specified external `buffer`&period;

== Synopsis

Declared in `&lt;bslma&lowbar;sequentialallocator&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
SequentialAllocator(
    char* buffer,
    int bufferSize,
    xref:BloombergLP/bslma/Allocator.adoc[Allocator]* basicAllocator = 0);
----

== Description

Create a sequential allocator for allocating memory blocks initially from the specified `buffer` the size (in bytes) of which is indicated by the absolute value of the specified `bufferSize`&period; Optionally specify an alignment `strategy` used to align allocated memory blocks&period; If `strategy` is not specified, _Natural Alignment_ is used&period; Optionally specify a `basicAllocator` used to supply memory&period; If `basicAllocator` is 0, the currently installed default allocator is used&period; If an `allocate` or `reserveCapacity` request cannot be satisfied from the current buffer, a new buffer is allocated, the size of which is determined by a buffer growth strategy implied by `bufferSize`&period; If `bufferSize` is negative, the buffer growth strategy used is _Geometric Growth_&semi; otherwise it is _Constant Growth_&period; (See the component level documentation for further details&period;) In either case, the new buffer will have sufficient capacity to satisfy the request&period; If _Geometric Growth_ is in effect, no limit is imposed on the size of buffers&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *buffer*
| The external buffer used for initial allocations&period;
| *bufferSize*
| The size (in bytes) of `buffer`&period;
| *basicAllocator*
| The allocator used to supply memory&period;
|===


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