[#bsl-unordered_map-0e6]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-02b.adoc[unordered_map<KEY, VALUE, HASH, bsl::equal_to<KEY>, ALLOCATOR>]
:relfileprefix: ../
:mrdocs:

Deduce the template parameters `KEY` and `VALUE` from the `value_type` of the iterators supplied to the constructor of `unordered_map`. Deduce the template parameters `HASH` and `ALLOCATOR` from the other parameters passed to the constructor of `unordered_map`. This deduction guide does not participate unless the supplied hash is invokable with a `KEY` and the supplied allocator meets the requirements of a standard allocator.

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class INPUT_ITERATOR,
    class HASH,
    class ALLOCATOR,
    class KEY = xref:BloombergLP/bslstl/IteratorUtil/IterKey_t.adoc[BloombergLP::bslstl::IteratorUtil::IterKey_t<INPUT_ITERATOR>],
    class VALUE = xref:BloombergLP/bslstl/IteratorUtil/IterMapped_t.adoc[BloombergLP::bslstl::IteratorUtil::IterMapped_t<INPUT_ITERATOR>]>
requires std::is_invocable_v<HASH, const KEY &> && bsl::IsStdAllocator_v<ALLOCATOR>
xref:bsl/unordered_map-02b.adoc[unordered_map<KEY, VALUE, HASH, bsl::equal_to<KEY>, ALLOCATOR>](
    INPUT_ITERATOR,
    INPUT_ITERATOR,
    bsl::allocator_traits<ALLOCATOR>::size_type,
    HASH,
    ALLOCATOR) -> xref:bsl/unordered_map-02b.adoc[unordered_map<KEY, VALUE, HASH, bsl::equal_to<KEY>, ALLOCATOR>];
----


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