[#BloombergLP-bslstl-IteratorUtil-IterKey_t]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/IteratorUtil.adoc[IteratorUtil]::IterKey_t
:relfileprefix: ../../../
:mrdocs:

Return the `key‐type` of the specified iterator type, which is expected to refer to a `pair<KEY_TYPE, MAPPED_TYPE>`.

== Synopsis

Declared in `<bslstl_iteratorutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITER>
using IterKey_t = xref:bsl/remove_const_t.adoc[bsl::remove_const_t<bsl::iterator_traits<INPUT_ITER>::value_type::first_type>];
----


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