[#bsl-unordered_multimap-0b0-2constructor-06]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multimap-0b0.adoc[unordered_multimap]::unordered_multimap
:relfileprefix: ../../
:mrdocs:

Constructors

== Synopses

Declared in `<bslstl_unorderedmultimap.h>`

Create an empty unordered multimap.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multimap-0b0/2constructor-0f.adoc[unordered_multimap]();
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-0f.adoc[_» more..._]#

Create an unordered multimap as a copy of `original`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multimap-0b0/2constructor-02b.adoc[unordered_multimap](xref:bsl/unordered_multimap-0b0.adoc[unordered_multimap] const& original);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-02b.adoc[_» more..._]#

Create an unordered multimap by moving from `original`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multimap-0b0/2constructor-01.adoc[unordered_multimap](xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<unordered_multimap>] original);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-01.adoc[_» more..._]#

Create an empty unordered multimap using `basicAllocator`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
xref:bsl/unordered_multimap-0b0/2constructor-0ab6.adoc[unordered_multimap](ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-0ab6.adoc[_» more..._]#

Create an empty unordered multimap with buckets and allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multimap-0b0/2constructor-022.adoc[unordered_multimap](
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-022.adoc[_» more..._]#

Create an unordered multimap by moving from `original` using `basicAllocator`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multimap-0b0/2constructor-030.adoc[unordered_multimap](
    xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<unordered_multimap>] original,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-030.adoc[_» more..._]#

Create a copy of `original` using `basicAllocator`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multimap-0b0/2constructor-0c.adoc[unordered_multimap](
    xref:bsl/unordered_multimap-0b0.adoc[unordered_multimap] const& original,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-0c.adoc[_» more..._]#

Create an unordered multimap from `values` using `basicAllocator`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class = void>
requires bsl::IsStdAllocator_v<ALLOCATOR>
xref:bsl/unordered_multimap-0b0/2constructor-0ab9.adoc[unordered_multimap](
    std::initializer_list<value_type> values,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-0ab9.adoc[_» more..._]#

Create an empty unordered multimap with hash and allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multimap-0b0/2constructor-0b4.adoc[unordered_multimap](
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets,
    HASH const& hashFunction,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-0b4.adoc[_» more..._]#

Create an unordered multimap from `[first, last)]` using `basicAllocator`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITERATOR>
xref:bsl/unordered_multimap-0b0/2constructor-04.adoc[unordered_multimap](
    INPUT_ITERATOR first,
    INPUT_ITERATOR last,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-04.adoc[_» more..._]#

Create an unordered multimap from `range` using `basicAllocator`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class RANGE>
xref:bsl/unordered_multimap-0b0/2constructor-037.adoc[unordered_multimap](
    std::from_range_t tag,
    RANGE&& range,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-037.adoc[_» more..._]#

Create an unordered multimap from `values` with bucket count and allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class = void>
requires bsl::IsStdAllocator_v<ALLOCATOR>
xref:bsl/unordered_multimap-0b0/2constructor-07.adoc[unordered_multimap](
    std::initializer_list<value_type> values,
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-07.adoc[_» more..._]#

Create an empty unordered multimap with the specified options.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
xref:bsl/unordered_multimap-0b0/2constructor-09d.adoc[unordered_multimap](
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets,
    HASH const& hashFunction = HASH(),
    EQUAL const& keyEqual = EQUAL(),
    ALLOCATOR const& basicAllocator = ALLOCATOR());
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-09d.adoc[_» more..._]#

Create an unordered multimap from `[first, last)]` with buckets and allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITERATOR>
xref:bsl/unordered_multimap-0b0/2constructor-05.adoc[unordered_multimap](
    INPUT_ITERATOR first,
    INPUT_ITERATOR last,
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-05.adoc[_» more..._]#

Create an unordered multimap from `range` with bucket count and allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class RANGE>
xref:bsl/unordered_multimap-0b0/2constructor-002.adoc[unordered_multimap](
    std::from_range_t tag,
    RANGE&& range,
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-002.adoc[_» more..._]#

Create an unordered multimap from `values` with hash and allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class = void,
    class = void>
requires std::is_invocable_v<HASH, const KEY &> && bsl::IsStdAllocator_v<ALLOCATOR>
xref:bsl/unordered_multimap-0b0/2constructor-090.adoc[unordered_multimap](
    std::initializer_list<value_type> values,
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets,
    HASH const& hashFunction,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-090.adoc[_» more..._]#

Create an unordered multimap from `[first, last)]` with hash and allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITERATOR>
xref:bsl/unordered_multimap-0b0/2constructor-0e.adoc[unordered_multimap](
    INPUT_ITERATOR first,
    INPUT_ITERATOR last,
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets,
    HASH const& hashFunction,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-0e.adoc[_» more..._]#

Create an unordered multimap from `range` with hash and allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class RANGE>
xref:bsl/unordered_multimap-0b0/2constructor-08.adoc[unordered_multimap](
    std::from_range_t tag,
    RANGE&& range,
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets,
    HASH const& hashFunction,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-08.adoc[_» more..._]#

Create an unordered multimap from the `values` initializer list.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class = void,
    class = void,
    class = void>
requires std::is_invocable_v<HASH, const KEY &> && std::is_invocable_v<EQUAL, const KEY &, const KEY &> && bsl::IsStdAllocator_v<ALLOCATOR>
xref:bsl/unordered_multimap-0b0/2constructor-021.adoc[unordered_multimap](
    std::initializer_list<value_type> values,
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets = 0,
    HASH const& hashFunction = HASH(),
    EQUAL const& keyEqual = EQUAL(),
    ALLOCATOR const& basicAllocator = ALLOCATOR());
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-021.adoc[_» more..._]#

Create an unordered multimap from the range `[first, last)]`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITERATOR>
xref:bsl/unordered_multimap-0b0/2constructor-00c.adoc[unordered_multimap](
    INPUT_ITERATOR first,
    INPUT_ITERATOR last,
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets = 0,
    HASH const& hashFunction = HASH(),
    EQUAL const& keyEqual = EQUAL(),
    ALLOCATOR const& basicAllocator = ALLOCATOR());
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-00c.adoc[_» more..._]#

Create an unordered multimap from the elements of `range`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class RANGE>
xref:bsl/unordered_multimap-0b0/2constructor-0b3.adoc[unordered_multimap](
    std::from_range_t tag,
    RANGE&& range,
    xref:bsl/unordered_multimap-0b0/size_type.adoc[size_type] initialNumBuckets = 0,
    HASH const& hashFunction = HASH(),
    EQUAL const& keyEqual = EQUAL(),
    ALLOCATOR const& basicAllocator = ALLOCATOR());
----

[.small]#xref:bsl/unordered_multimap-0b0/2constructor-0b3.adoc[_» more..._]#

== Parameters

[cols="1,4"]
|===
| Name| Description
| *original*
| unordered multimap to copy
| *basicAllocator*
| allocator used to supply memory
| *initialNumBuckets*
| minimum initial number of buckets
| *values*
| initializer list of elements to insert
| *hashFunction*
| hash function for keys
| *first*
| beginning of the range to copy
| *last*
| end of the range to copy
| *tag*
| disambiguation tag for range construction
| *range*
| input range of key/value pairs to insert
| *keyEqual*
| key‐equality functor
|===


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