[#BloombergLP-bslstl-Pair_IndexOfType-02]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::Pair_IndexOfType
:relfileprefix: ../../
:mrdocs:

This meta‐function provides a compile‐time way to obtain the index of `bsl::pair` element, having the (template parameter) type `T`. If neither type of pair's element is equal to `T` or both pair's elements have the same type, code is not compiled.

== Synopsis

Declared in `<bslstl_pair.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class T,
    class T1,
    class T2>
struct Pair_IndexOfType;
----

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/Pair_IndexOfType-00c.adoc[`Pair_IndexOfType<T1, T1, T2>`] 
| This partial specialization of `Pair_IndexOfType` returns the index of first element of pair.
| xref:BloombergLP/bslstl/Pair_IndexOfType-006.adoc[`Pair_IndexOfType<T2, T1, T2>`] 
| This partial specialization of `Pair_IndexOfType` returns the index of second element of pair.
|===



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