[#BloombergLP-bslmf-InvokeResult_VoidChecker]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmf.adoc[bslmf]::InvokeResult_VoidChecker
:relfileprefix: ../../
:mrdocs:

Empty type used to detect void expressions. The size of this type is the same as `bslmf::Tag<1>`.

== Synopsis

Declared in `<bslmf_invokeresult.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct InvokeResult_VoidChecker
    : xref:BloombergLP/bslmf/Tag-0b.adoc[Tag<true>]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:BloombergLP/bslmf/Tag-0b.adoc[Tag<true>]`
| Map an unsigned integral constant to a distinct C++ type.
|===

== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/InvokeResult_VoidChecker/d_lowerSizeArray.adoc[`d_lowerSizeArray`] 
| Lower 16 bits of the compile‐time size encoded by this tag.
| xref:BloombergLP/bslmf/InvokeResult_VoidChecker/d_upperSizeArray.adoc[`d_upperSizeArray`] 
| Upper 16 bits of the compile‐time size encoded by this tag.
|===



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