[#BloombergLP-bslstl-Function_SmallObjectOptimization]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Function_SmallObjectOptimization
:relfileprefix: ../../
:mrdocs:

Utility types and constants for `bsl::function` small‐object optimization.

== Synopsis

Declared in `<bslstl_function_smallobjectoptimization.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class Function_SmallObjectOptimization;
----

== Description

This utility `struct` provides a namespace for several types, type traits, and constants used in the implementation of the small‐object optimization for `bsl::function`.

== Types

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Function_SmallObjectOptimization/InplaceBuffer.adoc[`InplaceBuffer`] 
| Storage area for a functor representation using small‐object optimization.
| xref:BloombergLP/bslstl/Function_SmallObjectOptimization/IsInplaceFunc.adoc[`IsInplaceFunc`] 
| Boolean metafunction reporting whether `FN` uses the inplace buffer.
| xref:BloombergLP/bslstl/Function_SmallObjectOptimization/SooFuncSize.adoc[`SooFuncSize`] 
| Metafunction encoding object size and SOO eligibility for `TP`.
|===


== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Function_SmallObjectOptimization/k_NON_SOO_SMALL_SIZE.adoc[`k_NON_SOO_SMALL_SIZE`] 
| Encoding offset marking small functors that must not use SOO.
|===



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