[#BloombergLP-bdlc-FlatHashMap-try_emplace-03]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashMap.adoc[FlatHashMap]::try_emplace
:relfileprefix: ../../../
:mrdocs:

`try_emplace` overloads

== Synopses

Declared in `<bdlc_flathashmap.h>`

If a key equivalent to the specified `key` already exists in this map, return a pair containing an iterator referring to the existing item and `false`. Otherwise, insert into this map a newly‐created `value_type` object, constructed from `std::forward<KEY>(key)` and the specified `args`, and return a pair containing an iterator referring to the newly‐created entry, and `true`. This method requires that the (template parameter) types `KEY` and `VALUE` are `emplace‐constructible` from `key` and `args` respectively. For C++03, `VALUE` must also be `copy‐constructible`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... ARGS>
xref:bsl/pair-0b.adoc[bsl::pair<FlatHashMap<KEY, VALUE, HASH, EQUAL>::iterator, bool>]
xref:BloombergLP/bdlc/FlatHashMap/try_emplace-06.adoc[try_emplace](
    xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<KEY>] key,
    ARGS&&... args);
----

[.small]#xref:BloombergLP/bdlc/FlatHashMap/try_emplace-06.adoc[_» more..._]#

If a key equivalent to the specified `key` already exists in this map, return a pair containing an iterator referring to the existing item, and `false`. Otherwise, insert into this map a newly‐created `value_type` object, constructed from `key` and the specified `args`, and return a pair containing an iterator referring to the newly‐created entry and `true`. This method requires that the (template parameter) types `KEY` and `VALUE` are `emplace‐constructible` from `key` and `args` respectively. For C++03, `VALUE` must also be `copy‐constructible`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... ARGS>
xref:bsl/pair-0b.adoc[bsl::pair<FlatHashMap<KEY, VALUE, HASH, EQUAL>::iterator, bool>]
xref:BloombergLP/bdlc/FlatHashMap/try_emplace-04c.adoc[try_emplace](
    KEY const& key,
    ARGS&&... args);
----

[.small]#xref:BloombergLP/bdlc/FlatHashMap/try_emplace-04c.adoc[_» more..._]#

If a key equivalent to the specified `key` already exists in this map return a pair containing an iterator referring to the existing item and `false`. Otherwise, insert into this map a newly‐created `value_type` object, constructed from `std::forward<LOOKUP_KEY>(key)` and the specified `args`, and return a pair containing an iterator referring to the newly‐created entry, and `true`. This method requires that the (template parameter) types `KEY` and `VALUE` are `emplace‐constructible` from `key` and `args` respectively. For C++03, `VALUE` must also be `copy‐constructible`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LOOKUP_KEY,
    class... ARGS>
xref:bsl/pair-0b.adoc[bsl::pair<iterator, bool>]
xref:BloombergLP/bdlc/FlatHashMap/try_emplace-0b.adoc[try_emplace](
    LOOKUP_KEY&& key,
    ARGS&&... args)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
         && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----

[.small]#xref:BloombergLP/bdlc/FlatHashMap/try_emplace-0b.adoc[_» more..._]#

If a key equivalent to the specified `key` already exists in this map, return an iterator referring to the existing item. Otherwise, insert into this map a newly‐created `value_type` object, constructed from `std::forward<KEY>(key)` and the specified `args`, and return an iterator referring to the newly‐created entry. This method requires that the (template parameter) types `KEY` and `VALUE` are `emplace‐constructible` from `key` and `args` respectively. For C++03, `VALUE` must also be `copy‐constructible`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... ARGS>
xref:BloombergLP/bdlc/FlatHashMap/iterator.adoc[FlatHashMap<KEY, VALUE, HASH, EQUAL>::iterator]
xref:BloombergLP/bdlc/FlatHashMap/try_emplace-041.adoc[try_emplace](
    xref:BloombergLP/bdlc/FlatHashMap/const_iterator.adoc[const_iterator],
    xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<KEY>] key,
    ARGS&&... args);
----

[.small]#xref:BloombergLP/bdlc/FlatHashMap/try_emplace-041.adoc[_» more..._]#

If a key equivalent to the specified `key` already exists in this map, return an iterator referring to the existing item. Otherwise, insert into this map a newly‐created `value_type` object, constructed from `key` and the specified `args`, and return an iterator referring to the newly‐created entry. This method requires that the (template parameter) types `KEY` and `VALUE` are `emplace‐constructible` from `key` and `args` respectively. For C++03, `VALUE` must also be `copy‐constructible`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... ARGS>
xref:BloombergLP/bdlc/FlatHashMap/iterator.adoc[FlatHashMap<KEY, VALUE, HASH, EQUAL>::iterator]
xref:BloombergLP/bdlc/FlatHashMap/try_emplace-01.adoc[try_emplace](
    xref:BloombergLP/bdlc/FlatHashMap/const_iterator.adoc[const_iterator],
    KEY const& key,
    ARGS&&... args);
----

[.small]#xref:BloombergLP/bdlc/FlatHashMap/try_emplace-01.adoc[_» more..._]#

If a key equivalent to the specified `key` already exists in this map return an iterator referring to the existing item. Otherwise, insert into this map a newly‐created `value_type` object, constructed from `std::forward<LOOKUP_KEY>(key)` and the specified `args`, and return an iterator referring to the newly‐created entry. This method requires that the (template parameter) types `KEY` and `VALUE` are `emplace‐constructible` from `key` and `args` respectively. For C++03, `VALUE` must also be `copy‐constructible`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LOOKUP_KEY,
    class... ARGS>
xref:BloombergLP/bdlc/FlatHashMap/iterator.adoc[iterator]
xref:BloombergLP/bdlc/FlatHashMap/try_emplace-0d.adoc[try_emplace](
    xref:BloombergLP/bdlc/FlatHashMap/const_iterator.adoc[const_iterator],
    LOOKUP_KEY&& key,
    ARGS&&... args)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
         && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----

[.small]#xref:BloombergLP/bdlc/FlatHashMap/try_emplace-0d.adoc[_» more..._]#


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