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

This class is a Boolean metafunction that determines whether or not the specified `FN` template parameter should be allocated within the footprint of the `InplaceBuffer` (i.e., using the small‐object optimization.)

== Synopsis

Declared in `<bslstl_function_smallobjectoptimization.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class FN>
struct IsInplaceFunc
    : xref:bsl/integral_constant-02.adoc[bsl::integral_constant<bool, SooFuncSize<FN>::value <= sizeof(InplaceBuffer)>]
----

== Description

# Implementation Note In the future, `InplaceFunc` should also consider the alignment of `FN` in its determination of whether or not `bsl::function` will use the small‐object optimization. However, `bsl::function` currently has no way to specify alignment when it allocates memory.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/integral_constant-02.adoc[bsl::integral_constant<bool, SooFuncSize<FN>::value <= sizeof(InplaceBuffer)>]`
| Metafunction representing a compile‐time constant of the specified (template parameter) `t_TYPE` with the specified (template parameter) `t_VALUE`.
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/type.adoc[`type`] 
| Alias for this `integral_constant` specialization.
| xref:bsl/integral_constant-02/value_type.adoc[`value_type`] 
| 
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/operator_call.adoc[`operator()`] 
| Return a copy of the template argument `t_VALUE`.
| xref:bsl/integral_constant-02/2conversion.adoc[`operator value_type`] 
| 
|===


== Static Data Members

[cols="1"]
|===
| Name
| xref:bsl/integral_constant-02/value.adoc[`value`] 
|===



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