[#bsl-set-0d-emplace_hint]
= xref:bsl.adoc[bsl]::xref:bsl/set-0d.adoc[set]::emplace_hint
:relfileprefix: ../../
:mrdocs:

Emplace a newly constructed `value_type` near `hint` if not present.

== Synopsis

Declared in `<bslstl_set.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... Args>
xref:bsl/set-0d/iterator.adoc[set<KEY, COMPARATOR, ALLOCATOR>::iterator]
emplace_hint(
    xref:bsl/set-0d/const_iterator.adoc[const_iterator] hint,
    Args&&... arguments);
----

== Description

Construct by forwarding `get_allocator()` (if required) and the specified `arguments` to the corresponding constructor of `value_type` (in amortized constant time if `hint` is a valid immediate successor); otherwise this method has no effect (other than possibly creating a temporary `value_type` object). Return an iterator referring to the (possibly newly created and inserted) object in this set whose value is equivalent to that of an object constructed from `arguments`. If `hint` is not a valid immediate successor to the `value_type` object implied by `arguments`, this operation has `O[log(N)]` complexity where `N` is the size of this set. This method requires that the (template parameter) type `KEY` be `emplace‐constructible` from `arguments` (see {Requirements on `KEY`}). The behavior is undefined unless `hint` is an iterator in the range `[begin() .. end()]` (both endpoints included).

== Return Value

iterator to the existing or newly inserted element

== Parameters

[cols="1,4"]
|===
| Name| Description
| *hint*
| iterator hint for insertion position
| *arguments*
| constructor arguments for the new element
|===


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