[#bsl-unordered_multiset-06c-2constructor-0ab]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multiset-06c.adoc[unordered_multiset]::unordered_multiset
:relfileprefix: ../../
:mrdocs:

Constructors

== Synopses

Declared in `<bslstl_unorderedmultiset.h>`

Create an empty unordered multiset.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multiset-06c/2constructor-09e.adoc[unordered_multiset]();
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-09e.adoc[_» more..._]#

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multiset-06c/2constructor-00.adoc[unordered_multiset](xref:bsl/unordered_multiset-06c.adoc[unordered_multiset] const& original);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-00.adoc[_» more..._]#

Create an unordered multiset by moving from `original`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multiset-06c/2constructor-0e0d.adoc[unordered_multiset](xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<unordered_multiset>] original);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-0e0d.adoc[_» more..._]#

Create an empty unordered multiset using the specified `basicAllocator`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
xref:bsl/unordered_multiset-06c/2constructor-0c.adoc[unordered_multiset](ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-0c.adoc[_» more..._]#

Same as the preceding overload, using the specified allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multiset-06c/2constructor-017.adoc[unordered_multiset](
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-017.adoc[_» more..._]#

Create an unordered multiset by moving from `original` with `basicAllocator`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multiset-06c/2constructor-075.adoc[unordered_multiset](
    xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<unordered_multiset>] original,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-075.adoc[_» more..._]#

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multiset-06c/2constructor-03a.adoc[unordered_multiset](
    xref:bsl/unordered_multiset-06c.adoc[unordered_multiset] const& original,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-03a.adoc[_» more..._]#

Create an unordered multiset from the specified `values` initializer list using `basicAllocator`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class = void>
requires bsl::IsStdAllocator<ALLOCATOR>::value
xref:bsl/unordered_multiset-06c/2constructor-0a9.adoc[unordered_multiset](
    std::initializer_list<KEY> values,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-0a9.adoc[_» more..._]#

Same as the preceding overload, using the specified allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_multiset-06c/2constructor-071.adoc[unordered_multiset](
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets,
    HASH const& hashFunction,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-071.adoc[_» more..._]#

Same as the preceding overload, using the specified allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITERATOR>
xref:bsl/unordered_multiset-06c/2constructor-0e09.adoc[unordered_multiset](
    INPUT_ITERATOR first,
    INPUT_ITERATOR last,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-0e09.adoc[_» more..._]#

Same as the preceding overload, using the specified allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class RANGE>
xref:bsl/unordered_multiset-06c/2constructor-0e1.adoc[unordered_multiset](
    std::from_range_t tag,
    RANGE&& range,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-0e1.adoc[_» more..._]#

Same as the preceding overload, using the specified allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class = void>
requires bsl::IsStdAllocator<ALLOCATOR>::value
xref:bsl/unordered_multiset-06c/2constructor-036.adoc[unordered_multiset](
    std::initializer_list<KEY> values,
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-036.adoc[_» more..._]#

Same as the preceding overload, using the specified bucket count and hash/equality functors.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
xref:bsl/unordered_multiset-06c/2constructor-02.adoc[unordered_multiset](
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets,
    HASH const& hashFunction = HASH(),
    EQUAL const& keyEqual = EQUAL(),
    ALLOCATOR const& basicAllocator = ALLOCATOR());
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-02.adoc[_» more..._]#

Same as the preceding overload, using the specified allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITERATOR>
xref:bsl/unordered_multiset-06c/2constructor-019.adoc[unordered_multiset](
    INPUT_ITERATOR first,
    INPUT_ITERATOR last,
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-019.adoc[_» more..._]#

Same as the preceding overload, using the specified allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class RANGE>
xref:bsl/unordered_multiset-06c/2constructor-018.adoc[unordered_multiset](
    std::from_range_t tag,
    RANGE&& range,
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-018.adoc[_» more..._]#

Same as the preceding overload, using the specified allocator.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class = void,
    class = void>
requires std::is_invocable_v<HASH, const KEY &> && bsl::IsStdAllocator<ALLOCATOR>::value
xref:bsl/unordered_multiset-06c/2constructor-0e3.adoc[unordered_multiset](
    std::initializer_list<KEY> values,
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets,
    HASH const& hashFunction,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-0e3.adoc[_» more..._]#

Same as the preceding overload without a key‐equality functor.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITERATOR>
xref:bsl/unordered_multiset-06c/2constructor-04a.adoc[unordered_multiset](
    INPUT_ITERATOR first,
    INPUT_ITERATOR last,
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets,
    HASH const& hashFunction,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-04a.adoc[_» more..._]#

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class RANGE>
xref:bsl/unordered_multiset-06c/2constructor-06.adoc[unordered_multiset](
    std::from_range_t tag,
    RANGE&& range,
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets,
    HASH const& hashFunction,
    ALLOCATOR const& basicAllocator);
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-06.adoc[_» more..._]#

Create an unordered multiset from the specified `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_multiset-06c/2constructor-047.adoc[unordered_multiset](
    std::initializer_list<KEY> values,
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets = 0,
    HASH const& hashFunction = HASH(),
    EQUAL const& keyEqual = EQUAL(),
    ALLOCATOR const& basicAllocator = ALLOCATOR());
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-047.adoc[_» more..._]#

Create an unordered multiset from the specified iterator range.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITERATOR>
xref:bsl/unordered_multiset-06c/2constructor-0aa.adoc[unordered_multiset](
    INPUT_ITERATOR first,
    INPUT_ITERATOR last,
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets = 0,
    HASH const& hashFunction = HASH(),
    EQUAL const& keyEqual = EQUAL(),
    ALLOCATOR const& basicAllocator = ALLOCATOR());
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-0aa.adoc[_» more..._]#

Create an unordered multiset from the specified `range`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class RANGE>
xref:bsl/unordered_multiset-06c/2constructor-090.adoc[unordered_multiset](
    std::from_range_t tag,
    RANGE&& range,
    xref:bsl/unordered_multiset-06c/size_type.adoc[size_type] initialNumBuckets = 0,
    HASH const& hashFunction = HASH(),
    EQUAL const& keyEqual = EQUAL(),
    ALLOCATOR const& basicAllocator = ALLOCATOR());
----

[.small]#xref:bsl/unordered_multiset-06c/2constructor-090.adoc[_» more..._]#

== Parameters

[cols="1,4"]
|===
| Name| Description
| *original*
| unordered multiset to copy
| *basicAllocator*
| the allocator used to supply memory
| *initialNumBuckets*
| the initial number of buckets
| *values*
| initializer list of keys to insert
| *hashFunction*
| the hash function
| *first*
| the start of the iterator range
| *last*
| one past the end of the iterator range
| *tag*
| disambiguation tag selecting the range constructor
| *range*
| input range of elements to insert
| *keyEqual*
| the key‐equality functor
|===


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