[#BloombergLP-bslstl-Variant_IsAlternativeConstructibleFrom-06]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/Variant_IsAlternativeConstructibleFrom-0e.adoc[Variant&lowbar;IsAlternativeConstructibleFrom]&lt;t&lowbar;VARIANT, t&lowbar;TYPE, bsl&colon;&colon;variant&lowbar;npos&gt;
:relfileprefix: ../../
:mrdocs:

Derive from `bsl&colon;&colon;false&lowbar;type` when there is no unique best match&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;variant&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    class t&lowbar;VARIANT,
    class t&lowbar;TYPE&gt;
struct xref:BloombergLP/bslstl/Variant_IsAlternativeConstructibleFrom-0e.adoc[Variant&lowbar;IsAlternativeConstructibleFrom]&lt;t&lowbar;VARIANT, t&lowbar;TYPE, bsl&colon;&colon;variant&lowbar;npos&gt;
    : xref:bsl/false_type.adoc[bsl::false&lowbar;type]
----

== Description

This partial specialization of `Variant&lowbar;IsAlternativeConstructibleFrom` derives from `bsl&colon;&colon;false&lowbar;type` when there is no unique best match alternative (i&period;e&period;, `t&lowbar;INDEX` is `bsl&colon;&colon;variant&lowbar;npos`)&period;

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/false_type.adoc[bsl::false&lowbar;type]`
| Metafunction representing the boolean constant `false`&period;
|===


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