[#BSLSTL_VARIANT_INDEX_OF]
= BSLSTL_VARIANT_INDEX_OF
:mrdocs:

Compute the index of the first alternative identical to `TYPE`.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
#define BSLSTL_VARIANT_INDEX_OF(TYPE, VARIANT)

----

== Description

This component‐private macro expands to the index of the first alternative in the specified `VARIANT` that is identical to the specified `TYPE`, or `bsl::variant_npos` if no such alternative exists.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *TYPE*
| candidate alternative type
| *VARIANT*
| variant specialization to search
|===


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