[#BloombergLP-bdlma-BufferImpUtil-allocateFromBuffer]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlma.adoc[bdlma]::xref:BloombergLP/bdlma/BufferImpUtil.adoc[BufferImpUtil]::allocateFromBuffer
:relfileprefix: ../../../
:mrdocs:

Allocate a memory block from a buffer using the specified alignment strategy.

== Synopsis

Declared in `<bdlma_bufferimputil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
void*
allocateFromBuffer(
    xref:BloombergLP/bsls/Types/IntPtr.adoc[bsls::Types::IntPtr]* cursor,
    char* buffer,
    xref:BloombergLP/bsls/Types/size_type.adoc[bsls::Types::size_type] bufferSize,
    xref:BloombergLP/bsls/Types/size_type.adoc[bsls::Types::size_type] size,
    xref:BloombergLP/bsls/Alignment/Strategy.adoc[bsls::Alignment::Strategy] strategy);
----

== Description

Allocate a memory block of the specified `size` (in bytes) from the specified `buffer` having the specified `bufferSize` (in bytes) at the specified `cursor` position, using the specified alignment `strategy`. Return the address of the allocated memory block if `buffer` contains sufficient available memory, and 0 otherwise. The `cursor` is set to the first byte position immediately after the allocated memory if there is sufficient memory, and not modified otherwise. The behavior is undefined unless `0 < size`, `0 <= *cursor`, and `*cursor <= bufferSize`.

== Return Value

address of the allocated memory block if `buffer` contains sufficient available memory, and 0 otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cursor*
| byte offset into `buffer` at which to allocate
| *buffer*
| memory buffer from which to allocate
| *bufferSize*
| size in bytes of `buffer`
| *size*
| size in bytes of the memory block to allocate
| *strategy*
| alignment strategy used to align the allocated block
|===


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