[#bsl-map-0a7-try_emplace-0c]
= xref:bsl.adoc[bsl]::xref:bsl/map-0a7.adoc[map]::try_emplace
:relfileprefix: ../../
:mrdocs:

`try_emplace` overloads

== Synopses

Declared in `<bslstl_map.h>`

Try to emplace an element with a movable `key`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... Args>
xref:bsl/pair-0b.adoc[pair<map<KEY, VALUE, COMPARATOR, ALLOCATOR>::iterator, bool>]
xref:bsl/map-0a7/try_emplace-0de.adoc[try_emplace](
    xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<KEY>] key,
    Args&&... args);
----

[.small]#xref:bsl/map-0a7/try_emplace-0de.adoc[_» more..._]#

Try to emplace an element with `key` constructed from `args`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... Args>
xref:bsl/pair-0b.adoc[pair<map<KEY, VALUE, COMPARATOR, ALLOCATOR>::iterator, bool>]
xref:bsl/map-0a7/try_emplace-0be.adoc[try_emplace](
    KEY const& key,
    Args&&... args);
----

[.small]#xref:bsl/map-0a7/try_emplace-0be.adoc[_» more..._]#

Try to emplace an element with transparent `key`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LOOKUP_KEY,
    class... Args>
xref:bsl/pair-0b.adoc[pair<iterator, bool>]
xref:bsl/map-0a7/try_emplace-08.adoc[try_emplace](
    LOOKUP_KEY&& key,
    Args&&... args)
requires BloombergLP::bslmf::IsTransparentPredicate<COMPARATOR,
                                                   LOOKUP_KEY>::value &&
        !bsl::is_convertible<LOOKUP_KEY&&, const_iterator>::value &&
        !bsl::is_convertible<LOOKUP_KEY&&, iterator>::value;
----

[.small]#xref:bsl/map-0a7/try_emplace-08.adoc[_» more..._]#

Try to emplace an element with `key` near `hint`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... Args>
xref:bsl/map-0a7/iterator.adoc[map<KEY, VALUE, COMPARATOR, ALLOCATOR>::iterator]
xref:bsl/map-0a7/try_emplace-0b7.adoc[try_emplace](
    xref:bsl/map-0a7/const_iterator.adoc[const_iterator] hint,
    xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<KEY>] key,
    Args&&... args);
----

[.small]#xref:bsl/map-0a7/try_emplace-0b7.adoc[_» more..._]#

Try to emplace an element with `key` near `hint`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... Args>
xref:bsl/map-0a7/iterator.adoc[map<KEY, VALUE, COMPARATOR, ALLOCATOR>::iterator]
xref:bsl/map-0a7/try_emplace-0d6.adoc[try_emplace](
    xref:bsl/map-0a7/const_iterator.adoc[const_iterator] hint,
    KEY const& key,
    Args&&... args);
----

[.small]#xref:bsl/map-0a7/try_emplace-0d6.adoc[_» more..._]#

Try to emplace an element with transparent `key` near `hint`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LOOKUP_KEY,
    class... Args>
xref:bsl/map-0a7/iterator.adoc[iterator]
xref:bsl/map-0a7/try_emplace-04.adoc[try_emplace](
    xref:bsl/map-0a7/const_iterator.adoc[const_iterator] hint,
    LOOKUP_KEY&& key,
    Args&&... args)
requires BloombergLP::bslmf::IsTransparentPredicate<COMPARATOR,
                                                   LOOKUP_KEY>::value;
----

[.small]#xref:bsl/map-0a7/try_emplace-04.adoc[_» more..._]#

== Return Value

* pair of iterator and whether a new element was inserted
* iterator to the existing or newly inserted element

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key to move into the new element
| *args*
| constructor arguments for the mapped value
| *hint*
| iterator hint for the insertion position
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#