[#bsl-set-051]
= xref:bsl.adoc[bsl]::xref:bsl/set-0d.adoc[set<KEY>]
:relfileprefix: ../
:mrdocs:

Deduce `KEY` from iterators when an allocator pointer is supplied.

== Synopsis

Declared in `<bslstl_set.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class INPUT_ITERATOR,
    class ALLOC,
    class KEY = xref:BloombergLP/bslstl/IteratorUtil/IterVal_t.adoc[BloombergLP::bslstl::IteratorUtil::IterVal_t<INPUT_ITERATOR>],
    class DEFAULT_ALLOCATOR = xref:bsl/allocator-0df.adoc[bsl::allocator<KEY>]>
requires bsl::is_convertible_v<ALLOC *, DEFAULT_ALLOCATOR>
xref:bsl/set-0d.adoc[set<KEY>](
    INPUT_ITERATOR,
    INPUT_ITERATOR,
    ALLOC*) -> xref:bsl/set-0d.adoc[set<KEY>];
----

== Description

This deduction guide does not participate unless the specified `ALLOC` is convertible to `bsl::allocator<KEY>`.


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