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

When `invoke&lowbar;result` cannot deduce the actual return type of a functor (in C&plus;&plus;03 mode), it yields this type as a placeholder&period; The advantage of using this placeholder instead of a compilation failure (e&period;g&period;, using a static assert) is that the return type of an INVOKE() operation is often discarded, so our failure to deduce the return type is often harmless&period; Since `InvokeResultDeductionFailed` is a return type, it must be convertible from the actual return type&semi; this conversion is accomplished by means of a constructor that makes it convertible from _any_ type&period;

== Synopsis

Declared in `&lt;bslmf&lowbar;invokeresult&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct InvokeResultDeductionFailed;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslmf/InvokeResultDeductionFailed/2constructor.adoc[`InvokeResultDeductionFailed`]         [.small]#[constructor]#
| Convert from an arbitrary type&period; The actual argument value is discarded&period;
|===



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