[#bsl-set-0a]
= xref:bsl.adoc[bsl]::xref:bsl/set-0d.adoc[set<KEY, COMPARATOR, ALLOCATOR>]
:relfileprefix: ../
:mrdocs:

Deduce the template parameter `KEY` from the `value_type` of the iterators supplied to the constructor of `set`. Deduce the template parameters `COMPARATOR` and `ALLOCATOR` from the other parameters passed to the constructor. This guide does not participate unless the supplied (or defaulted) `ALLOCATOR` meets the requirements of a standard allocator.

== Synopsis

Declared in `<bslstl_set.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class INPUT_ITERATOR,
    class KEY = bsl::iterator_traits<INPUT_ITERATOR>::value_type,
    class COMPARATOR = std::less<KEY>,
    class ALLOCATOR = xref:bsl/allocator-0df.adoc[bsl::allocator<KEY>]>
requires !bsl::IsStdAllocator_v<COMPARATOR> && bsl::IsStdAllocator_v<ALLOCATOR>
xref:bsl/set-0d.adoc[set<KEY, COMPARATOR, ALLOCATOR>](
    INPUT_ITERATOR,
    INPUT_ITERATOR,
    COMPARATOR,
    ALLOCATOR) -> xref:bsl/set-0d.adoc[set<KEY, COMPARATOR, ALLOCATOR>];
----


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